Table 3

Caffeine consumption during pregnancy by maternal smoking in 1st trimester in controls in Scandinavia 1992–95, the Nordic epidemiological SIDS study

Maternal smokingCaffeine consumption
Nil1–800 mg/24 h> 800 mg/24 hTotal
n%n%n%n%
Nil12322.741376.261.1542100
1–4 cigarettes/day2419.79275.464.9122100
5–9 cigarettes/day89.56476.21214.384100
10–14 cigarettes/day1109900010100
>15 cigarettes/day0000000100
  • χ2 = 48.6; degrees of freedom (df) = 6; p < 0.001.