Skip to main content

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.