Table 2

Relative risk of SIDS for the dichotomised daily caffeine consumption variable in the first and third trimesters, and all pregnancy

Caffeine consumption (mg/day)No (%) SIDS infantsNo (%) control infantsOR (95% CI) unadjustedOR (95% CI) adjusted
First trimester
 Non-heavy (0–399) 263 (69.8)1293 (81.8) 1.001.00
 Heavy (⩾400) 114 (30.2) 288 (18.2) 1.95 (1.51 to 2.52)*** 1.30 (0.92 to 1.82)
Third trimester
 Non-heavy (0–399) 259 (68.7)1303 (82.4) 1.001.00
 Heavy (⩾400) 118 (31.3)278 (17.6) 2.14 (1.66 to 2.76)*** 1.46 (1.05 to 2.05)*
All pregnancy (both first and third trimesters)
 Non-heavy (0–399) 271 (71.9)1359 (86.0) 1.001.00
 Heavy (⩾400) 106 (28.1)222 (14.0) 2.42 (1.85 to 3.15)*** 1.65 (1.15 to 2.36)**
  • 2-151 Adjusted for infants’ age only.

  • 2-152 Adjusted for confounding factors listed in the . Wald statistic p values: *p<0.05, **p<0.01, ***p<0.001.