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Table 1 Distribution of potential confounders (N = 1702)

From: Cardiovascular health in the menopause transition: a longitudinal study of up to 3892 women with up to four repeated measures of risk factors

  N (%)
Pre-pregnancy BMI
 Normal 1287/1496 (86.0%)
 Overweight 170/1496 (11.4%)
 Obese 39/1496 (2.6%)
Smoking status (obtained at, or before, the first clinic)
 Never smoker 809/1483 (54.6%)
 Former smoker 525/1483 (35.4%)
 Current smoker 149/1483 (10.0%)
Alcohol intake frequency (obtained at, or before, the first clinic)
 Never or less than 4 times a month 468/1155 (40.5%)
 2 to 3 times a week 384/1155 (33.2%)
 4 or more times a week 303/1155 (26.2%)
Parity
 1 193/1702 (11.3%)
 2 567/1702 (33.3%)
 3 423/1702 (24.9%)
 4+ 518/1702 (30.5%)
Age at menarche (taken at time of recruitment to the study (mean age 28.3, SD 4.8))
 Early (≤ 11 years) 242/1507 (16.1%)
 Average (12-14 years) 1055/1507 (70.0%)
 Late (≥ 15 years) 210/1507 (13.9%)
Educational achievement (taken at time of recruitment to the study (mean age 28.3, SD 4.8))
 CSE/vocational degree/ O-level 688/1587 (43.4%)
 A-level 498/1587 (31.4%)
 University degree 401/1587 (25.3%)
  1. A-level advanced level, BMI body mass index, CSE certificate of secondary education, O-level ordinary level. In models pre-pregnancy BMI is a continuous variable