Table 4

Comparison of daily alcohol consumption averaged across pregnancy (method 2) and the composite measure of maternal alcohol consumption

Daily consumption of alcoholPercentage of women in each averaged alcohol group (%)
Averaged across pregnancyLowModerateBinge <weeklyBinge 1–2×/weekHeavy
Trimester 1
 <1 std drink/day68.922.83.22.82.2
 1 or more std drinks/day3.47.91.114.673.0
Trimester 2
 <1 std drink/day79.018.51.50.60.5
 1 or more std drinks/day3.78.53.715.968.3
Trimester 3
 <1 std drink/day79.218.61.10.40.7
 1 or more std drinks/day7.214.52.410.865.1
Daily consumption of alcoholPercentage of women in each composite* alcohol group (%)
Averaged across pregnancyLowModerateBinge <weeklyBinge 1–2×/weekHeavy
Trimester 1
 <1 std drink/day99.898.498.480.639.8
 1 or more std drinks/day0.21.61.619.460.2
Trimester 2
 <1 std drink/day99.898.190.645.815.2
 1 or more std drinks/day0.21.99.454.284.8
Trimester 3
 <1 std drink/day99.697.092.347.121.7
 1 or more std drinks/day0.43.07.752.978.3
  • * “Composite” method using quantity, frequency and dose of alcohol per occasion.

  • The daily consumption, when averaged across pregnancy, gives one value representing the average quantity of alcohol consumed per day for each woman during her pregnancy.