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Table 1 Characteristics of children and parents according to entry in daycare

From: Impact of early daycare on healthcare resource use related to upper respiratory tract infections during childhood: prospective WHISTLER cohort study

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
  1. AOM, acute otitis media; IR, incidence rate; URTI, upper respiratory tract infection.