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Table 1 Characteristics of the participating mother/child pairsa

From: Immune cell counts and risks of respiratory infections among infants exposed pre- and postnatally to organochlorine compounds: a prospective study

  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   No:86 Yes:14   No:89 Yes:11  
Alcoholb No:82 Yes:18   No:83 Yes:17   No:77 Yes:23  
Nursingc Whole:81 Partial:19   Whole:84 Partial:16   Whole:91 Partial:9  
Infant's sex Girl:44 Boy:56   Girl:58 Boy:42   Girl:57 Boy:43  
Vaccination No:69 Yes:31   No:76 Yes:24   No:85 Yes:15  
Resp. infection No:72 Yes:28   No:71 Yes:29   No:78 Yes:22  
  1. aMother's and infant's age: median (range). WBCs were analyzed in a subgroup of 86 infants, and within this subgroup lymphocyte subsets were analyzed among 52 infants with enough blood left after WBC count analysis.
  2. bDuring pregnancy.
  3. cPartial nursing also includes no nursing.