Abstract:
:Descriptive statistics are specific methods basically used to calculate, describe, and summarize collected research data in a logical, meaningful, and efficient way. Descriptive statistics are reported numerically in the manuscript text and/or in its tables, or graphically in its figures. This basic statistical tutorial discusses a series of fundamental concepts about descriptive statistics and their reporting. The mean, median, and mode are 3 measures of the center or central tendency of a set of data. In addition to a measure of its central tendency (mean, median, or mode), another important characteristic of a research data set is its variability or dispersion (ie, spread). In simplest terms, variability is how much the individual recorded scores or observed values differ from one another. The range, standard deviation, and interquartile range are 3 measures of variability or dispersion. The standard deviation is typically reported for a mean, and the interquartile range for a median. Testing for statistical significance, along with calculating the observed treatment effect (or the strength of the association between an exposure and an outcome), and generating a corresponding confidence interval are 3 tools commonly used by researchers (and their collaborating biostatistician or epidemiologist) to validly make inferences and more generalized conclusions from their collected data and descriptive statistics. A number of journals, including Anesthesia & Analgesia, strongly encourage or require the reporting of pertinent confidence intervals. A confidence interval can be calculated for virtually any variable or outcome measure in an experimental, quasi-experimental, or observational research study design. Generally speaking, in a clinical trial, the confidence interval is the range of values within which the true treatment effect in the population likely resides. In an observational study, the confidence interval is the range of values within which the true strength of the association between the exposure and the outcome (eg, the risk ratio or odds ratio) in the population likely resides. There are many possible ways to graphically display or illustrate different types of data. While there is often latitude as to the choice of format, ultimately, the simplest and most comprehensible format is preferred. Common examples include a histogram, bar chart, line chart or line graph, pie chart, scatterplot, and box-and-whisker plot. Valid and reliable descriptive statistics can answer basic yet important questions about a research data set, namely: "Who, What, Why, When, Where, How, How Much?"
journal_name
Anesth Analgjournal_title
Anesthesia and analgesiaauthors
Vetter TRdoi
10.1213/ANE.0000000000002471subject
Has Abstractpub_date
2017-11-01 00:00:00pages
1797-1802issue
5eissn
0003-2999issn
1526-7598journal_volume
125pub_type
杂志文章abstract::Attempted pulmonary artery catheterization via the left internal jugular vein resulted in a misdiagnosis of pulmonary hypertension before transesophageal echocardiography revealed the catheter positioned in the ascending aorta. Inadvertent aortic cannulation through an unusual type of partial anomalous pulmonary venou...
journal_title:Anesthesia and analgesia
pub_type: 杂志文章
doi:10.1213/01.ane.0000296459.51820.64
更新日期:2008-01-01 00:00:00
abstract:BACKGROUND:Although studies have compared safety and outcomes of radial artery cannulation with other arterial catheterization locations, there is insufficient information describing brachial artery catheterization. In this study, we characterized the perioperative use patterns and the complication rates associated wit...
journal_title:Anesthesia and analgesia
pub_type: 杂志文章
doi:10.1213/ANE.0000000000000082
更新日期:2014-02-01 00:00:00
abstract:UNLABELLED:In the present study, we investigated the effect of remifentanil on cerebral blood flow velocity (CBFV). We investigated 20 patients (ASA physical status III) scheduled for elective coronary artery bypass graft surgery. Anesthesia was induced with remifentanil 5 microg/kg IV (Group 1, n = 10) or 2 microg/kg ...
journal_title:Anesthesia and analgesia
pub_type: 临床试验,杂志文章
doi:10.1097/00000539-199809000-00013
更新日期:1998-09-01 00:00:00
abstract:BACKGROUND:Preoperative flushing of an anesthesia workstation is an alternative for preparation of the anesthesia workstation before use in malignant hyperthermia-susceptible patients (MHS). We studied in vitro, using a test lung, the washout profile of sevoflurane in 7 recent workstations during adult and, for the fir...
journal_title:Anesthesia and analgesia
pub_type: 杂志文章
doi:10.1213/ANE.0000000000000208
更新日期:2014-07-01 00:00:00
abstract:BACKGROUND:Dexmedetomidine, a selective α2-adrenergic agonist currently approved for continuous intensive care unit sedation, is being widely evaluated for its role as a potential anesthetic. The closed-loop anesthesia delivery system (CLADS) is a method to automatically administer propofol total intravenous anesthesia...
journal_title:Anesthesia and analgesia
pub_type: 杂志文章,随机对照试验
doi:10.1213/ANE.0000000000003470
更新日期:2019-07-01 00:00:00
abstract::The effect of ketamine on intraocular pressure (IOP) was studied in 10 children. Control IOP values were determined prior to induction of anesthesia, following premedication with atropine alone or in combination with pentobarbital and meperidine. After the IM injection of 8 mg/kg of ketamine, the IOP was determined at...
journal_title:Anesthesia and analgesia
pub_type: 杂志文章
doi:10.1213/00000539-197611000-00005
更新日期:1976-11-01 00:00:00
abstract:UNLABELLED:Encouraged by the popularity of the pulse oximeter pulse-tone, we developed and tested an auditory display of six physiologic variables. The display consisted of a cardiovascular sound triggered by every heartbeat (conveying heart rate) and a respiratory sound triggered by every breath (conveying respiratory...
journal_title:Anesthesia and analgesia
pub_type: 杂志文章
doi:10.1097/00000539-200202000-00025
更新日期:2002-02-01 00:00:00
abstract::Pituitary adenomas often present with the symptoms of hormonal hypersecretion, and although medical therapy is available for most hyperfunctioning states, it is not curative. As a result, transsphenoidal pituitary surgery has become a commonly performed neurosurgical procedure with unique challenges for the anesthesio...
journal_title:Anesthesia and analgesia
pub_type: 杂志文章,评审
doi:10.1213/01.ane.0000166976.61650.ae
更新日期:2005-10-01 00:00:00
abstract::To test the hypothesis that acute subarachnoid hemorrhage is associated with abnormal myocardial perfusion, we assessed myocardial blood flow with thallium scintigraphy in 19 patients with a confirmed subarachnoid hemorrhage and an abnormal electrocardiogram. A thallium scan was performed at the bedside of each patien...
journal_title:Anesthesia and analgesia
pub_type: 杂志文章
doi:10.1213/00000539-199302000-00009
更新日期:1993-02-01 00:00:00
abstract::Sensory level of anesthesia following the injection of 20 ml of 1.5% lidocaine with epinephrine (1:200,000) in 238 adult males averaged T7.7, T5.6, and T5.1 at 10, 20, and 30 minutes, respectively. Patient age had no significant effect on local anesthetic requirements per spinal segment per unit height until age 40 ye...
journal_title:Anesthesia and analgesia
pub_type: 杂志文章
doi:
更新日期:1980-10-01 00:00:00
abstract::A newly developed transtracheal Doppler (TTD) computer for cardiac output determination was studied in nine patients after open heart surgery (coronary artery bypass grafting, n = 4; mitral valve replacement, n = 5). The measurements were compared with those simultaneously obtained by thermodilation. Doppler signals w...
journal_title:Anesthesia and analgesia
pub_type: 临床试验,杂志文章
doi:10.1213/00000539-199206000-00004
更新日期:1992-06-01 00:00:00
abstract::This study examined anesthetic development and hemodynamic changes during two techniques of hyperbaric lidocaine administration through 27-gauge intrathecal catheters for continuous spinal anesthesia in 55 elderly patients undergoing transurethral prostatic resection. Twenty-five patients were randomly assigned to rec...
journal_title:Anesthesia and analgesia
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1213/00000539-199407000-00022
更新日期:1994-07-01 00:00:00
abstract:BACKGROUND:Cell-free hemoglobin (Hb) forms in stored red blood cells (RBCs) as a result of hemolysis. Studies suggest that this cell-free Hb may decrease nitric oxide (NO) bioavailability, potentially leading to endothelial dysfunction, vascular injury, and multiorgan dysfunction after transfusion. We tested the hypoth...
journal_title:Anesthesia and analgesia
pub_type: 杂志文章
doi:10.1213/ANE.0000000000001392
更新日期:2016-08-01 00:00:00
abstract::Previous studies have demonstrated that, with the exception of atracurium, resistance to the neuromuscular blocking effects of various muscle relaxants develops in patients receiving anticonvulsant therapy. We studied the effects of 0.5 mg/kg IV atracurium in 53 neurosurgical patients: 21 nonepileptic patients receivi...
journal_title:Anesthesia and analgesia
pub_type: 杂志文章
doi:10.1213/00000539-199012000-00015
更新日期:1990-12-01 00:00:00
abstract::We studied the time to postoperative micturition and the duration of analgesia in 82 children aged 6 mo to 10 yr undergoing herniorrhaphy or orchiopexy under general anesthesia with N2O and halothane. All received D5 lactate Ringer's solution equivalent to 6 h maintenance intraoperatively, and oral fluids postoperativ...
journal_title:Anesthesia and analgesia
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1213/00000539-199301000-00029
更新日期:1993-01-01 00:00:00
abstract:BACKGROUND:Drugs such as propofol and ketamine are used alone or in combination to provide sedation for medical procedures in children. The purpose of this systematic review was to compare the safety and effectiveness of propofol and ketamine to other drug regimens. METHODS:We searched Medline, Embase, Cochrane Centra...
journal_title:Anesthesia and analgesia
pub_type: 杂志文章
doi:10.1213/ANE.0000000000004967
更新日期:2020-07-07 00:00:00
abstract::Cardiac output characteristically decreases during trimethaphan infusion but is well maintained or increased during sodium nitroprusside infusion. We postulated that at similar levels of mean arterial pressure, sodium nitroprusside might be associated with greater blood loss than trimethaphan due to the increase in ca...
journal_title:Anesthesia and analgesia
pub_type: 杂志文章
doi:
更新日期:1980-03-01 00:00:00
abstract::We considered the allocation of operating room (OR) time at facilities where the strategic decision had been made to increase the number of ORs. Allocation occurs in two stages: a long-term tactical stage followed by short-term operational stage. Tactical decisions, approximately 1 yr in advance, determine what specia...
journal_title:Anesthesia and analgesia
pub_type: 杂志文章
doi:10.1213/01.ANE.0000149898.45044.3D
更新日期:2005-05-01 00:00:00
abstract:UNLABELLED:We investigated the physiological reaction to mobilization the first and second day after aortic valve replacement in an open, prospective study. Hemodynamic and oxygenation variables were recorded in 15 patients using a pulmonary artery oximetry catheter and bench oximetry. Serious intraoperative events occ...
journal_title:Anesthesia and analgesia
pub_type: 临床试验,杂志文章
doi:10.1213/01.ane.0000096194.10459.7e
更新日期:2004-02-01 00:00:00
abstract::Initial, but not subsequent, inhalation of 8% desflurane produces transient sympathetic stimulation. We hypothesized that initial but not subsequent increases should produce pupil dilation, and that N2O, fentanyl, and clonidine, but not esmolol, should blunt the response. In 10 volunteers, we maintained anesthesia wit...
journal_title:Anesthesia and analgesia
pub_type: 杂志文章
doi:10.1097/00000539-199508000-00028
更新日期:1995-08-01 00:00:00
abstract::We compared laryngeal aperture (LA) exposure and endotracheal intubation difficulty scale (IDS) scores between balloon-assisted and conventional laryngoscopy. Thirty-two anesthetized and paralyzed elective surgery patients underwent laryngoscopy with a standard number 4 and a modified number 4 curved blade carrying a ...
journal_title:Anesthesia and analgesia
pub_type: 临床试验,杂志文章
doi:10.1097/00000539-200012000-00040
更新日期:2000-12-01 00:00:00
abstract::We determined the heart rate (HR) response to enflurane, halothane, and isoflurane and the effects of narcotics on this response in 81 healthy patients scheduled for elective surgery. Patients were randomly assigned to one of six treatment groups: one of the three anesthetics (approximately 0.9 MAC) in 60% nitrous oxi...
journal_title:Anesthesia and analgesia
pub_type: 临床试验,杂志文章,随机对照试验
doi:
更新日期:1987-02-01 00:00:00
abstract:BACKGROUND:The diagnosis of postoperative cognitive dysfunction (POCD) requires complicated neuropsychological testing and is often delayed. Possible biomarkers for early detection or prediction are essential for the prevention and treatment of POCD. Preoperative screening of salivary cortisol levels may help to identi...
journal_title:Anesthesia and analgesia
pub_type: 杂志文章
doi:10.1213/ANE.0000000000003740
更新日期:2019-02-01 00:00:00
abstract::The analgesic effects of butorphanol tartrate and morphine sulfate were compared in 127 patients judged to have moderate to severe pain following major operations. The study was double-blind, and the drugs were given IM at several dosage levels. Scores for pain intensity and relief, as well as pain-intensity differenc...
journal_title:Anesthesia and analgesia
pub_type: 临床试验,杂志文章
doi:10.1213/00000539-197605000-00025
更新日期:1976-05-01 00:00:00
abstract:BACKGROUND:We evaluated the interaction of dopamine-proxymetacaine and dopamine- oxybuprocaine antinociception using isobolograms. METHODS:This experiment uses subcutaneous drug (proxymetacaine, oxybuprocaine, and dopamine) injections under the skin of the rat's back, thus simulating infiltration blocks. The dose-rela...
journal_title:Anesthesia and analgesia
pub_type: 杂志文章
doi:10.1213/ANE.0000000000002635
更新日期:2018-05-01 00:00:00
abstract:BACKGROUND:Estimating volume status in infants and neonates is challenging. Global end-diastolic volume (GEDV) and dynamic variables of preload, such as pulse pressure variation (PPV), may be alternative variables for estimating cardiac preload and fluid responsiveness. Therefore, we designed the present study to evalu...
journal_title:Anesthesia and analgesia
pub_type: 杂志文章
doi:10.1213/01.ane.0000281152.72734.d0
更新日期:2007-11-01 00:00:00
abstract:UNLABELLED:The National Institute for Occupational Safety and Health-recommended exposure levels for nitrous oxide exposure are 25 ppm as a time-weighted average over the time of exposure. The exposure limit for halogenated anesthetics (without concomitant nitrous oxide exposure) is 2 ppm. Inhaled sevoflurane provides ...
journal_title:Anesthesia and analgesia
pub_type: 杂志文章
doi:10.1097/00000539-199904000-00045
更新日期:1999-04-01 00:00:00
abstract::Because we have noticed dramatic hemodynamic responses in brain dead patients undergoing surgery for organ donation, we analyzed the anesthetic records of cadaver organ donors. Ten records contain complete data for heart rate, blood pressure, central venous pressure, and time of incision. Systolic pressure increased b...
journal_title:Anesthesia and analgesia
pub_type: 杂志文章
doi:
更新日期:1985-02-01 00:00:00
abstract::The anesthetic propofol (2,6 diisopropylphenol) mediates some of its effects by activating inhibitory chloride currents in the lower brainstem and spinal cord. The effects comprise direct activation of gamma-aminobutyric acid-A and glycine receptors in the absence of the natural agonist, as well as potentiation of the...
journal_title:Anesthesia and analgesia
pub_type: 杂志文章
doi:10.1213/01.ane.0000120083.10269.54
更新日期:2004-07-01 00:00:00
abstract:UNLABELLED:Nasotracheal intubation is often required during dental and maxillofacial surgery. The complications of nasotracheal intubation are well documented, but there have been few systematic attempts to find methods for their prevention. We examined intubation-related carriage of bacteria, especially methicillin-re...
journal_title:Anesthesia and analgesia
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1213/01.ane.0000066258.20778.06
更新日期:2003-07-01 00:00:00