| Study groups | ||||||||
---|---|---|---|---|---|---|---|---|---|
Variable | Infections (N = 190) | White blood cells (N = 86) | Lymphocyte subsets (N = 52) | ||||||
Mother's age (yr) | 28 (21–41) | 29 (21–36) | 29 (22–35) | ||||||
Infant's age (d) | 92 (75–123) | 93 (76–112) | 93 (76–112) | ||||||
 | Percent | Percent | Percent | ||||||
School yrs | ≤ 13:50 | 14–16:24 | >16:26 | ≤ 13:50 | 14–16:27 | >16:23 | ≤ 13:43 | 14–16:30 | >16:27 |
Smokingb | No:82 | Yes:18 | Â | No:86 | Yes:14 | Â | No:89 | Yes:11 | Â |
Alcoholb | No:82 | Yes:18 | Â | No:83 | Yes:17 | Â | No:77 | Yes:23 | Â |
Nursingc | Whole:81 | Partial:19 | Â | Whole:84 | Partial:16 | Â | Whole:91 | Partial:9 | Â |
Infant's sex | Girl:44 | Boy:56 | Â | Girl:58 | Boy:42 | Â | Girl:57 | Boy:43 | Â |
Vaccination | No:69 | Yes:31 | Â | No:76 | Yes:24 | Â | No:85 | Yes:15 | Â |
Resp. infection | No:72 | Yes:28 | Â | No:71 | Yes:29 | Â | No:78 | Yes:22 | Â |