Table 4.
Multinomial logistical regression of sibship size or structure for thinness among boys
| Total N | Grade 1 thinness | Grade 2 thinness | Grade 3 thinness | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Model Ia | Model IIb | Model IIIc | Model Ia | Model IIb | Model IIIc | Model Ia | Model IIb | Model IIIc | ||
| Number of siblings | ||||||||||
| None (only child) | 26,351 | 1.00 (Ref) | 1.00 (Ref) | 1.00 (Ref) | 1.00 (Ref) | 1.00 (Ref) | 1.00 (Ref) | 1.00 (Ref) | 1.00 (Ref) | 1.00 (Ref) |
| One | 3457 | 1.13 (1.03, 1.24)* | 1.11 (1.00, 1.24) | 1.10 (0.98, 1.24) | 1.27 (1.02, 1.60)* | 1.34 (1.07, 1.69)* | 1.28 (1.00, 1.63) | 1.48 (1.08, 2.03)* | 1.38 (0.96, 1.99) | 1.31 (0.89, 1.92) |
| Two or more | 6027 | 1.00 (0.88, 1.12) | 0.96 (0.83, 1.12) | 0.96 (0.80, 1.16) | 1.41 (1.19, 1.67)* | 1.46 (1.17, 1.82)* | 1.29 (1.02, 1.64)* | 2.16 (1.61, 2.90)* | 1.88 (1.30, 2.72)* | 1.60 (1.07, 2.40)* |
| Birth order | ||||||||||
| Only child | 26,351 | 1.00 (Ref) | 1.00 (Ref) | 1.00 (Ref) | 1.00 (Ref) | 1.00 (Ref) | 1.00 (Ref) | 1.00 (Ref) | 1.00 (Ref) | 1.00 (Ref) |
| Oldest child | 3331 | 0.95 (0.81, 1.12) | 0.91 (0.75, 1.10) | 0.89 (0.73, 1.08) | 1.33 (1.07, 1.64)* | 1.28 (1.02, 1.61)* | 1.32 (1.03, 1.70)* | 1.57 (1.20, 2.04)* | 1.34 (0.99, 1.82) | 1.26 (0.90, 1.77) |
| Middle child | 3923 | 1.09 (0.92, 1.30) | 1.08 (0.86, 1.35) | 1.11 (0.86, 1.44) | 1.36 (1.10, 1.68)* | 1.45 (1.08, 1.93)* | 1.20 (0.93, 1.56) | 2.14 (1.57, 2.94)* | 1.97 (1.29, 3.02)* | 1.61 (0.98, 2.64) |
| Youngest child | 1869 | 1.13 (0.96, 1.32) | 1.16 (0.94, 1.44) | 1.17 (0.95, 1.45) | 1.54 (1.14, 2.08)* | 1.73 (1.30, 2.28)* | 1.44 (1.09, 1.90)* | 1.82 (1.28, 2.59)* | 1.74 (1.20, 2.52)* | 1.53 (1.01, 2.33)* |
| Number of younger siblings | ||||||||||
| None (only child) | 26,351 | 1.00 (Ref) | 1.00 (Ref) | 1.00 (Ref) | 1.00 (Ref) | 1.00 (Ref) | 1.00 (Ref) | 1.00 (Ref) | 1.00 (Ref) | 1.00 (Ref) |
| One (oldest child) | 1614 | 1.09 (0.86, 1.37) | 1.04 (0.79, 1.38) | 1.03 (0.77, 1.39) | 0.94 (0.69, 1.28) | 0.91 (0.64, 1.28) | 1.03 (0.73, 1.45) | 1.13 (0.71, 1.81) | 1.04 (0.64, 1.68) | 1.03 (0.63, 1.68) |
| Two or more (oldest child) | 1717 | 0.81 (0.61, 1.08) | 0.78 (0.60, 1.02) | 0.74 (0.55, 0.99) | 1.70 (1.30, 2.23)* | 1.64 (1.20, 2.23)* | 1.59 (1.12, 2.28)* | 2.00 (1.47, 2.72)* | 1.60 (1.06, 2.41)* | 1.44 (0.90, 2.29) |
| Number of older siblings | ||||||||||
| None (only child) | 26,351 | 1.00 (Ref) | 1.00 (Ref) | 1.00 (Ref) | 1.00 (Ref) | 1.00 (Ref) | 1.00 (Ref) | 1.00 (Ref) | 1.00 (Ref) | 1.00 (Ref) |
| One (youngest child) | 1738 | 1.17 (0.96,1.42) | 1.20 (0.93, 1.56) | 1.19 (0.92, 1.55) | 1.60 (1.18, 2.16)* | 1.82 (1.35, 2.46)* | 1.57 (1.18, 2.09)* | 1.77 (1.23, 2.56)* | 1.70 (1.10, 2.62)* | 1.52 (0.91, 2.53) |
| Two or more (youngest child) | 131 | 0.61 (0.14, 2.61) | 0.66 (0.13, 3.24) | 0.74 (0.14, 3.86) | 0.81 (0.29, 2.26) | 0.89 (0.20, 3.98) | 0.93 (0.22, 4.01) | 2.53 (0.82, 7.77) | 2.91 (0.73, 11.63) | 2.47 (0.66, 9.26) |
Ref: reference category
a Model I: adjusted for age
b Model II: adjusted for age and childhood characteristics (birthweight, feeding patterns, parental age at child birth, workday TV time, internet use time, snacking frequency)
c Model III: adjusted for age, childhood characteristics and family characteristics (parental weight status, parental educational level, family income and residential site)
*p < 0.05