Table 1.
Characteristics of children and parents according to entry in daycare
| Study population |
Baseline population with complete data |
No daycare in first year of life (ref) |
Daycare entry in first year of life |
P
-value |
|---|---|---|---|---|
| Number = 1,728 | Number = 350 | Number = 1,378 | ||
|
Parental characteristics |
|
|
|
|
| Parental education level (%) |
|
|
|
<0.001 |
| Low/middle |
17.3 |
39.7 |
11.6 |
|
| High (at least one parent) |
82.7 |
60.3 |
88.4 |
|
|
Child characteristics |
|
|
|
|
| Gender (% boy) |
49.2 |
47.4 |
49.7 |
0.241 |
| Duration of exclusive breastfeeding (%) |
|
|
|
<0.001 |
| No breastfeeding |
18.9 |
27.4 |
16.8 |
|
| 0 to 3 months |
44.3 |
38.6 |
45.8 |
|
| 4 to 6 months |
22.8 |
17.4 |
24.2 |
|
| >6 months |
13.9 |
16.6 |
13.3 |
|
| % with older siblings |
51.6 |
58.9 |
49.7 |
0.001 |
| IR of URTI and AOM per age category /100 child-years (95% confidence interval) |
|
|
|
|
| 0 to 1 year |
92.9 (88.3 to 97.7) |
59.1 (51.1 to 67.9) |
100.4 (96.0 to 107.0) |
<0.001 |
| 1 to 2 year |
76.5 (72.2 to 80.8) |
71.2 (63.0 to 81.4) |
77.6 (72.9 to 82.6) |
0.28 |
| 2 to 3 year |
46.0 (42.5 to 49.7) |
52.5 (44.7 to 61.2) |
44.2 (40.4 to 48.3) |
0.07 |
| 3 to 4 year |
33.0 (29.7 to 36.4) |
38.5 (31.5 to 46.7) |
31.5 (28.0 to 35.3) |
0.09 |
| 4 to 5 year |
28.9 (25.7 to 32.5) |
41.7 (33.9 to 50.8) |
25.0 (21.6 to 28.8) |
<0.001 |
| 5 to 6 year | 25.5 (22.1 to 2.92) | 41.6 (33.2 to 51.6) | 20.4 (17.0 to 24.3) | <0.001 |
AOM, acute otitis media; IR, incidence rate; URTI, upper respiratory tract infection.