Abstract:
OBJECTIVES:To examine the association of plasma caffeine concentrations during pregnancy with fetal growth and to compare this with relations with reported caffeine intake. DESIGN:Prospective population based study. SETTING:District general hospital, inner London. SUBJECTS:Women booking for delivery between 1982 and 1984. Stored plasma was available for 1,500 women who had provided a blood sample on at least one occasion and for 640 women who had provided a sample on all three occasions (at booking, 28 weeks, and 36 weeks). MAIN OUTCOME MEASURE:Birth weight adjusted for gestational age, maternal height, parity, and sex of infant. The exposures of interest were reported caffeine consumption and blood caffeine concentration. Cigarette smoking was assessed by blood cotinine concentration. RESULTS:Caffeine intake showed no changes during pregnancy, but blood caffeine concentrations rose by 75%. Although caffeine intake increased steadily with increasing cotinine concentration above 15 ng/ml, blood caffeine concentrations fell. Caffeine consumption was inversely related to adjusted birth weight, the estimated effect being a 1.3% fall in birth weight for a 1,000 mg per week increase in intake (95% confidence interval 0.5% to 2.1%). The apparent caffeine effect was confined to cigarette smokers, among whom the estimated effect was-1.6%/1000 mg a week (-2.9% to -0.2%) after adjustment for cotinine and -1.3% (-2.7% to 0.1%) after further adjustment for social class and alcohol intake. Adjusted birth weight was unrelated to blood caffeine concentrations overall (P = 0.09, but a positive coefficient), after adjustment for cotinine (P = 0.73), or among current smokers (P = 0.45). CONCLUSIONS:Smokers consume more caffeine than non-smokers. Blood caffeine concentrations during pregnancy are not related to fetal growth, but caffeine intake is negatively associated with birth weight, with this effect being apparent only in smokers. The effect remains of borderline significance after adjustment for other factors. Prudent advice for pregnant women would be to reduce caffeine intake in conjunction with stopping smoking.
journal_name
BMJjournal_title
BMJ (Clinical research ed.)authors
Cook DG,Peacock JL,Feyerabend C,Carey IM,Jarvis MJ,Anderson HR,Bland JMdoi
10.1136/bmj.313.7069.1358subject
Has Abstractpub_date
1996-11-30 00:00:00pages
1358-62issue
7069eissn
0959-8138issn
1756-1833journal_volume
313pub_type
杂志文章abstract:OBJECTIVE:To investigate the association of enteroviruses with motor neurone disease, also known as amyotrophic lateral sclerosis. DESIGN:Analysis by enterovirus polymerase chain reaction of wax embedded material from spinal cords taken at necropsy from subjects with motor neurone disease and from age and sex matched ...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.308.6943.1541
更新日期:1994-06-11 00:00:00
abstract:OBJECTIVE:To investigate the effect of two different food supplements on body mass index (BMI) in wasted Malawian adults with HIV who were starting antiretroviral therapy. DESIGN:Randomised, investigator blinded, controlled trial. SETTING:Large, public clinic associated with a referral hospital in Blantyre, Malawi. ...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章,随机对照试验
doi:10.1136/bmj.b1867
更新日期:2009-05-22 00:00:00
abstract:OBJECTIVES:To determine prospectively the rates of change in bone mineral density in elderly people and to examine the relation between lifestyle and demographic factors and these rates of change. DESIGN:Longitudinal population based study. SETTING:Dubbo, New South Wales, Australia. SUBJECTS:Representative sample (n...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:
更新日期:1994-09-17 00:00:00
abstract:OBJECTIVE:To compare the efficacy and safety of rectal artemether with intravenous quinine in the treatment of cerebral malaria in children. DESIGN:Randomised, single blind, clinical trial. SETTING:Acute care unit at Mulago Hospital, Uganda's national referral and teaching hospital in Kampala. PARTICIPANTS:103 child...
journal_title:BMJ (Clinical research ed.)
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1136/bmj.330.7487.334
更新日期:2005-02-12 00:00:00
abstract:OBJECTIVES:To investigate the effectiveness of non-benzodiazepine hypnotics (Z drugs) and associated placebo responses in adults and to evaluate potential moderators of effectiveness in a dataset used to approve these drugs. DESIGN:Systematic review and meta-analysis. DATA SOURCE:US Food and Drug Administration (FDA)...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章,meta分析,评审
doi:10.1136/bmj.e8343
更新日期:2012-12-17 00:00:00
abstract:OBJECTIVE:To assess the ability of radiographers to identify abnormal radiographs of patients attending accident and emergency departments. DESIGN:Prospective study over six weeks. SETTING:Teaching hospital casualty x ray department. PATIENTS:3394 consecutive patients referred for radiography. INTERVENTIONS:Radiogr...
journal_title:BMJ (Clinical research ed.)
pub_type: 临床试验,杂志文章
doi:10.1136/bmj.302.6776.568
更新日期:1991-03-09 00:00:00
abstract:OBJECTIVE:To estimate the impact of a national primary care pay for performance scheme, the Quality and Outcomes Framework in England, on emergency hospital admissions for ambulatory care sensitive conditions (ACSCs). DESIGN:Controlled longitudinal study. SETTING:English National Health Service between 1998/99 and 20...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.g6423
更新日期:2014-11-11 00:00:00
abstract::The UN has reported that five multinational pharmaceutical companies would cut down HIV drug prices in the developing world. One of these drug companies is GlaxoWellcome, which has promised to reduce the price of zidovudine and lamivudine to US$2 in the poorest nations, a fifth of its price in the US. Although Peter ...
journal_title:BMJ (Clinical research ed.)
pub_type: 新闻
doi:10.1136/bmj.320.7246.1357
更新日期:2000-05-20 00:00:00
abstract:OBJECTIVES:To identify the frequency with which antibiotics are prescribed in the absence of a documented indication in the ambulatory care setting, to quantify the potential effect on assessments of appropriateness of antibiotics, and to understand patient, provider, and visit level characteristics associated with ant...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章,多中心研究
doi:10.1136/bmj.l6461
更新日期:2019-12-11 00:00:00
abstract:OBJECTIVE:To investigate the association between several types of soy products and all cause and cause specific mortality. DESIGN:Population based cohort study. SETTING:Japan Public Health Centre-based Prospective Study, which includes 11 public health centre areas in Japan. PARTICIPANTS:92 915 participants (42 750 ...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.m34
更新日期:2020-01-29 00:00:00
abstract:OBJECTIVES:To compare patterns of admission to hospital and prognosis in white and South Asian patients newly admitted with heart failure, and to evaluate the effect of personal characteristics and comorbidity on outcome. DESIGN:Historical cohort study. SETTING:UK district health authority (population 960,000). PART...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.327.7414.526
更新日期:2003-09-06 00:00:00
abstract:OBJECTIVES:To determine whether an aid to the diagnosis of pigmented skin lesions reduces the ratio of benign lesions to melanomas excised in general practice. DESIGN:Controlled trial randomised by practice. SETTING:General practices in Perth, Western Australia. PARTICIPANTS:468 general practitioners in 223 practice...
journal_title:BMJ (Clinical research ed.)
pub_type: 临床试验,杂志文章,多中心研究,随机对照试验
doi:10.1136/bmj.327.7411.375
更新日期:2003-08-16 00:00:00
abstract:OBJECTIVE:To examine the associations between neuraxial anaesthesia or general anaesthesia and clinical outcomes, length of hospital stay, and readmission in adults undergoing lower limb revascularisation surgery. DESIGN:Comparative effectiveness study using linked, validated, population based databases. SETTING:Onta...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.m4104
更新日期:2020-11-25 00:00:00
abstract::A randomised controlled trial of two management regimens was carried out in women patients over 65 years of age with hip fractures. Ninety seven patients were admitted to a designated orthopaedic geriatric unit and 125 to orthopaedic wards. No difference was observed in mortality, length of stay, or placement of patie...
journal_title:BMJ (Clinical research ed.)
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1136/bmj.297.6656.1116
更新日期:1988-10-29 00:00:00
abstract:OBJECTIVE:To determine the relation between mothers' self reported drinking habits before, during, and after pregnancy and infants' mental and motor development at 18 months of age. DESIGN:Follow up study of all singleton live births born to primigravidas living in Dundee and booked into antenatal clinics from 1 May 1...
journal_title:BMJ (Clinical research ed.)
pub_type: 临床试验,杂志文章
doi:10.1136/bmj.303.6793.22
更新日期:1991-07-06 00:00:00
abstract:OBJECTIVE:To study the effects on children of humanitarian aid agencies restricting help to refugee families (internally displaced people). DESIGN:Follow up study of 3 months. SETTING:Prabis peninsular outside Bissau, the capital of Guinea-Bissau, which has functioned as a refugee area for internally displaced people...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.319.7214.878
更新日期:1999-10-02 00:00:00
abstract:OBJECTIVE:To determine whether the increased iron demands of pregnancy could be met by increased absorption from dietary sources. DESIGN AND SETTING:Longitudinal prospective study in the research unit of a maternity hospital. SUBJECTS:12 normal pregnant women. INTERVENTIONS:At 12, 24, and 36 weeks' gestation (within...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.309.6947.79
更新日期:1994-07-09 00:00:00
abstract:OBJECTIVES:To evaluate the cost effectiveness of human papillomavirus testing after treatment for cervical intraepithelial neoplasia (CIN). DESIGN:Economic analysis using a Markov modelling approach to combine cost and epidemiological data from the NHS Sentinel Sites Study with data from previous studies of post-treat...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.e7086
更新日期:2012-10-31 00:00:00
abstract:OBJECTIVES:To examine how insurance companies assess proposals for life assurance from applicants with raised cholesterol concentrations and to determine the excess mortality rating applied. DESIGN:Survey of 49 companies underwriting term life assurance. SETTING:United Kingdom. SUBJECTS:Four fictional men aged 30 se...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.302.6781.891
更新日期:1991-04-13 00:00:00
abstract:OBJECTIVE:To review and critically appraise published and preprint reports of prediction models for diagnosing coronavirus disease 2019 (covid-19) in patients with suspected infection, for prognosis of patients with covid-19, and for detecting people in the general population at increased risk of becoming infected with...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.m1328
更新日期:2020-04-07 00:00:00
abstract:OBJECTIVE:To investigate the association between cerebral palsy and direct evidence for perinatal exposure to neurotropic viruses. DESIGN:Population based case-control study. SETTING:Adelaide Women's and Children's Hospital Research Laboratory. PARTICIPANTS AND MAIN OUTCOME MEASURES:Newborn screening cards of 443 wh...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.38668.616806.3A
更新日期:2006-01-14 00:00:00
abstract:OBJECTIVE:To determine whether genetic factors associated with established rheumatoid arthritis could, in combination with rheumatoid factor, predict the development of radiological erosions in patients with early symmetrical (rheumatoid-like) arthritis. DESIGN:Prospective study. SETTING:Teaching hospital, early arth...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.305.6866.1387
更新日期:1992-12-05 00:00:00
abstract:PROBLEM:Prophylactic treatment and follow-up after exposure to HIV, hepatitis B, and hepatitis C outside hospital needs to be improved. BACKGROUND AND SETTING:Until January 2000, people in Amsterdam could report exposure outside hospital to either a hospital or the municipal health service. If they reported to the mun...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.330.7495.825
更新日期:2005-04-09 00:00:00
abstract::The issue of children on hunger strike (voluntary total fasting) has not been reported before. The World Medical Association Declaration of Tokyo 1975 and the Declaration of Malta 1991 (revised 1992) provide clinicians with guidelines for the management of adult patients on hunger strike but do not mention children. W...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.312.7029.501
更新日期:1996-02-24 00:00:00
abstract:OBJECTIVE:To evaluate the primary care communications initiative, which introduced NHSnet to primary care in Scotland. DESIGN:Semi-structured telephone interviews, postal questionnaire. SETTING:All 15 Scottish health boards, random sample of 1 in 3 of all Scottish general practices. PARTICIPANTS:Information manageme...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.321.7265.878
更新日期:2000-10-07 00:00:00
abstract::To assess whether calcitonin is important in maintaining the integrity of bone the calcitonin gene of a young male patient with osteoporosis and no detectable plasma concentrations of calcitonin was studied. Genomic Southern blots with various restriction enzymes showed no large abnormalities in his calcitonin gene. G...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章,收录出版
doi:10.1136/bmj.298.6682.1215
更新日期:1989-05-06 00:00:00
abstract:OBJECTIVE:To synthesise the views of patients and carers in decision making regarding treatment for chronic kidney disease, and to determine which factors influence those decisions. DESIGN:Systematic review of qualitative studies of decision making and choice for dialysis, transplantation, or palliative care, and them...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章,评审
doi:10.1136/bmj.c112
更新日期:2010-01-19 00:00:00
abstract:OBJECTIVE:To determine whether being overweight in childhood increases adult obesity and risk of disease. DESIGN:Prospective cohort study. SETTING:City of Newcastle upon Tyne. PARTICIPANTS:932 members of thousand families 1947 birth cohort, of whom 412 attended for clinical examination age 50. MAIN OUTCOME MEASURES...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.323.7324.1280
更新日期:2001-12-01 00:00:00
abstract:OBJECTIVE:To prepare and assess the sensitivity and specificity of a latex agglutination test specific for the serotype of antigen in diagnosing pneumococcal pneumonia in Gambian children. DESIGN:Comparison of agglutination test specific for serotype with culture of blood and lung aspirates, countercurrent immunoelect...
journal_title:BMJ (Clinical research ed.)
pub_type: 临床试验,杂志文章
doi:10.1136/bmj.298.6680.1061
更新日期:1989-04-22 00:00:00
abstract:OBJECTIVE:To estimate the high risk group for cardiovascular disease in a well defined Norwegian population according to European guidelines and the systematic coronary risk evaluation system. DESIGN:Modelling study. SETTING:Nord-Tröndelag health study 1995-7 (HUNT 2), Norway. PARTICIPANTS:5548 participants of the N...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.38555.648623.8F
更新日期:2005-09-10 00:00:00