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Table 4 Multinomial logistical regression of sibship size or structure for thinness among boys

From: Association of number of siblings, birth order, and thinness in 3- to 12-year-old children: a population-based cross-sectional study in Shanghai, China

  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)
  1. Ref: reference category
  2. a Model I: adjusted for age
  3. 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)
  4. c Model III: adjusted for age, childhood characteristics and family characteristics (parental weight status, parental educational level, family income and residential site)
  5. *p < 0.05