Methods This retrospecti ve cohort study analyzed the data during 23 years period from Jan 1,1975 to Dec 31,1997.According to arsenic concentration in their drinking water,2 140 cases w ere divided into <0.05 mg/L group,0.05~0.50 mg/L group and ≥0.50 mg/L group.
方法采用回顾性队列研究方法 ,自 1975年 1月 1日至 1997年 12月 31日历时 2 3年 ,按接触水砷浓度将 2 140名调查对象分为 :<0 .0 5 m g/ L 组、0 .0 5～ 0 .5 0 mg/ L 组和≥ 0 .5 0 mg/ L 组。
[Result] Ten prospective cohort studies and one retrospective cohort study with 991 cases were included. The RSA group with active immunotherapy showed apparent curative effects(OR6.72,95%CI2.65～17.02),and had a higher successful pregnancy rate than the comparing group(OR2.45,95%CI1.65～3.63).
To further explore the relationship between intestine cancer and exposure to wood dust,we conducted a retrospective cohort mortality study ,with resposed group followup was made from january 1,1978 through Dec 31,1992,of 2362(male 1707,femeale 655)woodworkers (33679 personyears)employed at any time until 1977 by a wood processing factory of Chengdu,China,with unexposed group followup from january 1, 1972 through Dce.
To study the effect of tobacco dust on the mortalities from malignant neoplasm and respiratory diseases,the causes of death from malignant neoplasm and respiratory diseases among workers in two Cigarette Factories of Henan and Heilongjiang provinces who died in the period from 1982 to 1994 were analyzed by retrospective cohort method.
A total of 7,371 patients with hypertension with ages ≥40 years were selected from a population-based cohort study of the risk factors for stroke.
A cohort study of 327 French adolescents was carried out from 1983 to 1985 to invesingate 1) the prevalence, incidence and remission rates of alcohol consumption 2) the significance of alcohol consumption before age 16 and its evolution.
The relationship between psychological health and occupational class was investigated in the large British sample of 23-year-old subjects from the 1958 birth cohort study.
A descriptive and comparative analysis of data from HIV-infected and-uninfected homosexual men in the Multicenter AIDS Cohort Study was performed.
Incidence of dementia and cognitive decline in over-75s in Cambridge: overview of cohort study
An updated cohort mortality study of workers at a northeastern United States petroleum refinery
Objective: A retrospective cohort mortality study was conducted to assess long-term health risk in a group of tar distillery workers and roofers in order to investigate the existence of carcinogenic effects related to the occupational exposures.
Methods: The study design was a historical cohort mortality study and a nested case-control study concerning lung cancer.
A retrospective cohort mortality study on workers of two thermoelectric power plants: fourteen-year follow-up results
Two examples are used to illustrate the methods, namely Hyde's (1980) Channing House data and a large cohort mortality study of asbestos workers in Quebec.