Abstract:
:Before conducting a scientific study, a power analysis is performed to determine the sample size required to test an effect within allowable probabilities of Type I error (α) or Type II error (β). The power of a study is related to Type II error by 1-β. Most scientific studies set α=0.05 and power=0.80 as minimums. More conservative study designs will decrease α or increase power, which will require a larger sample size. The third and final parameter required for a power analysis is the effect size (ES). ES is a measure of the strength of the observation in the outcome of interest (ie, the dependent variable). ES must be estimated from pilot studies or published values. A small ES will require a larger sample size than a large ES. It is possible to detect statistically significant findings even for very small ES, if the sample size is sufficiently large. Therefore, it is also essential to evaluate whether ES is sufficiently large to be clinically meaningful.
journal_name
Clin Spine Surgjournal_title
Clinical spine surgeryauthors
Nicholson KJ,Reyes AA,Sherman M,Divi SN,Vaccaro ARdoi
10.1097/BSD.0000000000001079subject
Has Abstractpub_date
2020-09-22 00:00:00eissn
2380-0186issn
2380-0194pub_type
杂志文章abstract:STUDY DESIGN:A case series study. OBJECTIVE:To investigate the electrophysiological location of nerve root entrapment in patients with isthmic spondylolisthesis. SUMMARY OF BACKGROUND DATA:Although the lesion of the nerve root in patients with isthmic spondylolisthesis has been thought to be located at the pars inter...
journal_title:Clinical spine surgery
pub_type: 杂志文章
doi:10.1097/BSD.0000000000000047
更新日期:2017-04-01 00:00:00
abstract:STUDY DESIGN:A retrospective study of preoperative and postoperative magnetic resonance imaging (MRI) findings in spinal ependymoma. OBJECTIVE:The goal of the study was to examine MRI features, including the syrinx component volume, after surgical resection of spinal ependymoma, and to relate these features to extent ...
journal_title:Clinical spine surgery
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doi:10.1097/BSD.0000000000001061
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abstract:BACKGROUND:All doctors know that P-value<0.05 is "the Graal," but publications require further parameters [odds ratios, confidence interval (CI), etc.] to better analyze scientific data. AIM:The aim of this study was to present P-values, CI, and common effect-sizes (Cohen d, odds ratio, and various coefficients) in a ...
journal_title:Clinical spine surgery
pub_type: 杂志文章
doi:10.1097/BSD.0000000000000695
更新日期:2018-11-01 00:00:00
abstract:STUDY DESIGN:A method for measuring occipitocervical angle. OBJECTIVE:To develop a new method of measurement for assessing the occipitocervical angle using intraoperative fluoroscopic imaging, and to examine its reliability. SUMMARY OF BACKGROUND DATA:To avoid postoperative complications following occipitocervical fu...
journal_title:Clinical spine surgery
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doi:10.1097/BSD.0000000000000478
更新日期:2017-08-01 00:00:00
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journal_title:Clinical spine surgery
pub_type: 杂志文章
doi:10.1097/BSD.0000000000000721
更新日期:2019-03-01 00:00:00
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journal_title:Clinical spine surgery
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doi:10.1097/BSD.0000000000000610
更新日期:2018-06-01 00:00:00
abstract:STUDY DESIGN:Expansive pedicle screws (EPS) and polymethylmethacrylate-augmented pedicle screws (PMMA-PS) were inserted into osteoporotic synthetic bones, which were then tested by radiographic and biomechanical examinations. OBJECTIVE:To compare the stability of EPS and PMMA-PS with that of a conventional pedicle scr...
journal_title:Clinical spine surgery
pub_type: 杂志文章
doi:10.1097/BSD.0b013e31828bfc85
更新日期:2016-08-01 00:00:00
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journal_title:Clinical spine surgery
pub_type: 杂志文章
doi:10.1097/BSD.0000000000000279
更新日期:2017-12-01 00:00:00
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journal_title:Clinical spine surgery
pub_type: 杂志文章
doi:10.1097/BSD.0000000000001070
更新日期:2020-10-09 00:00:00
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journal_title:Clinical spine surgery
pub_type: 杂志文章
doi:10.1097/BSD.0000000000000588
更新日期:2017-11-01 00:00:00
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journal_title:Clinical spine surgery
pub_type: 杂志文章
doi:10.1097/BSD.0000000000000079
更新日期:2016-02-01 00:00:00
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journal_title:Clinical spine surgery
pub_type: 杂志文章
doi:10.1097/BSD.0000000000000747
更新日期:2019-04-01 00:00:00
abstract:STUDY DESIGN:Retrospective data analysis. OBJECTIVE:The aim of this study was to analyze correlations between spinopelvic configuration and fracture pattern or location in traumatic vertebral fractures. SUMMARY OF BACKGROUND DATA:The spinopelvic configuration represented by the pelvic incidence (PI) angle showed to h...
journal_title:Clinical spine surgery
pub_type: 杂志文章
doi:10.1097/BSD.0000000000000035
更新日期:2017-04-01 00:00:00
abstract:STUDY DESIGN:This study was a retrospective radiographic analysis of consecutive patients. OBJECTIVES:To analyze exposure to radiation of the surgeon and-separately-of patients in minimally invasive surgery (MIS) of multilevel posterior stabilization by percutaneous pedicle screw insertion guided by navigation (PIN) v...
journal_title:Clinical spine surgery
pub_type: 杂志文章
doi:10.1097/BSD.0000000000000807
更新日期:2019-06-01 00:00:00
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journal_title:Clinical spine surgery
pub_type: 杂志文章,评审
doi:10.1097/BSD.0000000000000377
更新日期:2016-05-01 00:00:00
abstract:STUDY DESIGN:This was a cross-sectional cohort study. OBJECTIVE:The objective of this study was to identify the prevalence of sleep disturbance in patients with symptomatic lumbar spinal stenosis (LSS) and to establish the relationship between sleep disturbance and both functional disability and health-related quality...
journal_title:Clinical spine surgery
pub_type: 杂志文章
doi:10.1097/BSD.0000000000000944
更新日期:2020-05-01 00:00:00
abstract:STUDY DESIGN:This is a cross-sectional study. OBJECTIVE:To investigate spine surgeons' attitudes regarding preoperative anxiety measurement, management, and responsibility. SUMMARY OF BACKGROUND DATA:The vast majority of patients scheduled for spine surgery experience preoperative anxiety. However, there are currentl...
journal_title:Clinical spine surgery
pub_type: 杂志文章
doi:10.1097/BSD.0000000000000705
更新日期:2019-02-01 00:00:00
abstract::Syrinx can be secondary to many etiologies, including tumor, Chiari malformation, tethered cord, or sequelae of infection or trauma. Posttraumatic syringomyelia, a potential complication of spinal injury, can insidiously present years after the initial event. Expansion of the cerebrospinal fluid-filled cyst can lead t...
journal_title:Clinical spine surgery
pub_type: 杂志文章
doi:10.1097/BSD.0000000000000835
更新日期:2020-06-01 00:00:00
abstract:STUDY DESIGN:An observational prospective cohort study. OBJECTIVE:To investigate the influence of natural history on the recovery of patients with cervical spondylotic myelopathy (CSM) after anterior cervical decompression. SUMMARY OF BACKGROUND DATA:The natural history of CSM has not been clearly elucidated, it rema...
journal_title:Clinical spine surgery
pub_type: 杂志文章
doi:10.1097/BSD.0000000000000873
更新日期:2019-10-01 00:00:00
abstract:STUDY DESIGN:Propensity score matched retrospective study using a nationwide longitudinal database. OBJECTIVE:To quantify the longitudinal economic impact of venous thromboembolism (VTE) complications in spinal fusion patients. SUMMARY OF BACKGROUND DATA:VTE is a rare and serious complication that may occur after spi...
journal_title:Clinical spine surgery
pub_type: 杂志文章
doi:10.1097/BSD.0000000000000450
更新日期:2017-12-01 00:00:00
abstract::Meralgia paresthetica is a non-life-threatening neurological disorder characterized by numbness, tingling, and burning pain over the anterolateral thigh due to impingement of the lateral femoral cutaneous nerve. This disorder has been seen in patients with diabetes mellitus and obesity, but has also been observed in p...
journal_title:Clinical spine surgery
pub_type: 杂志文章,评审
doi:10.1097/BSD.0000000000000593
更新日期:2018-03-01 00:00:00
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更新日期:2017-10-01 00:00:00
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journal_title:Clinical spine surgery
pub_type: 杂志文章
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更新日期:2016-02-01 00:00:00
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journal_title:Clinical spine surgery
pub_type: 杂志文章
doi:10.1097/BSD.0000000000000244
更新日期:2017-05-01 00:00:00
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journal_title:Clinical spine surgery
pub_type: 杂志文章
doi:10.1097/BSD.0000000000000370
更新日期:2016-04-01 00:00:00
abstract:STUDY DESIGN:This is a retrospective comparative review. OBJECTIVE:The objective of this study was to identify the influence of body mass index (BMI) on postsurgical complications and patient reported outcomes measures (PROMs) following lumbar decompression surgery. SUMMARY OF BACKGROUND DATA:Current literature does ...
journal_title:Clinical spine surgery
pub_type: 杂志文章
doi:10.1097/BSD.0000000000001001
更新日期:2020-12-01 00:00:00
abstract:STUDY DESIGN:A retrospective study. OBJECTIVE:To investigate whether proximal junctional kyphosis (PJK) or obvious proximal junctional angle (PJA) changes in the sagittal plane develops following short fusion in children younger than 10 years of age with congenital scoliosis, and to investigate the possible risk facto...
journal_title:Clinical spine surgery
pub_type: 杂志文章
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更新日期:2017-05-01 00:00:00
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journal_title:Clinical spine surgery
pub_type: 杂志文章
doi:10.1097/BSD.0000000000001073
更新日期:2020-10-02 00:00:00
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journal_title:Clinical spine surgery
pub_type: 杂志文章
doi:10.1097/BSD.0000000000000169
更新日期:2017-07-01 00:00:00
abstract::Microsoft Excel (MS Excel) is a commonly used program for data collection and statistical analysis in biomedical research. However, this program has many limitations, including fewer functions that can be used for analysis and a limited number of total cells compared with dedicated statistical programs. MS Excel canno...
journal_title:Clinical spine surgery
pub_type: 杂志文章
doi:10.1097/BSD.0000000000000382
更新日期:2016-06-01 00:00:00