TABLE I.
Descriptive statistics of the study population
| Age 1 y (n = 285) | Age 6 y (n = 259) | Age 8 y (n = 238) | |
|---|---|---|---|
| Gender | |||
| Male (%) | 56% (161) | 57% (147) | 57% (135) |
| Female (%) | 44% (124) | 43% (112) | 43% (103) |
| Maternal allergy | |||
| Yes | 83% (230) | 83% (207) | 83% (195) |
| No | 17% (48) | 17% (44) | 17% (39) |
| Maternal asthma | |||
| Yes | 42% (115) | 43% (106) | 41% (93) |
| No | 58% (160) | 57% (143) | 59% (135) |
| Exclusive breastfeeding | |||
| <2mo | 43% (122) | 42% (110) | 41% (98) |
| 2–4mo | 22% (64) | 22% (57) | 21% (51) |
| ≥4mo | 35% (99) | 36% (92) | 37% (89) |
| Smoking exposure during infancy | |||
| Yes | 25% (71) | 25% (64) | 24% (56) |
| No | 75% (214) | 75% (195) | 76% (182) |
| Daycare attendance during infancy | |||
| Yes | 54% (153) | 55% (142) | 55% (130) |
| No | 46% (132) | 45% (117) | 45% (108) |
| Having older children in the household during infancy | |||
| Yes | 58% (166) | 59% (154) | 60% (143) |
| No | 42% (119) | 41% (105) | 40% (95) |
| Dog in household at birth | |||
| Yes | 35% (101) | 36% (92) | 36% (85) |
| No | 65% (184) | 64% (167) | 64% (153) |
| Cat in household at birth | |||
| Yes | 29% (84) | 29% (76) | 29% (68) |
| No | 71% (201) | 71% (183) | 71% (170) |
| RV wheezing during infancy | |||
| Yes | 16% (47) | 17% (45) | 17% (41) |
| No | 84% (238) | 83% (214) | 83% (197) |
| Birth weight percentile | 53.3 ± 29.1 | 53.6 ± 29.0 | 53.5 ± 28.9 |
| Weight-for-length percentile at 1 y | 49.0 ± 30.6 | 48.8 ± 30.5 | 49.0 ± 30.3 |
| Weight for-length percentile at 2 y | 49.7 ± 32.2 | 50.1 ± 32.3 | 49.8 ± 32.0 |
| BMI percentile at 3 y | 55.8 ± 28.6 | 56.5 ± 28.5 | 56.5 ± 28.2 |
| BMI percentile at 5 y | 59.3 ± 28.2 | 59.4 ± 28.1 | 59.0 ± 27.7 |
*
p-value < 0.05 from chi-square test.