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Table 5 Multinomial logistical regression of sibship size or structure for thinness among girls

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) 22746 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 3395 1.21 (1.06,1.36)* 1.20 (1.04, 1.39)* 1.22 (1.05, 1.42)* 1.26 (1.02, 1.55)* 1.23 (0.94, 1.60) 1.27 (0.94, 1.70) 1.56 (1.15, 2.11)* 1.06 (1.17, 2.17)* 1.39 (0.97, 1.99)
 Two or more 5598 1.03 (0.91, 1.17) 0.96 (0.81, 1.14) 0.97 (0.78, 1.20) 1.18 (0.98, 1.43) 1.19 (1.01, 1.40)* 1.16 (0.97, 1.40) 2.25 (1.68, 3.02)* 2.02 (1.29, 3.15)* 1.49 (0.99, 2.24)
Birth order
 Only child 22746 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 4610 1.14 (1.04, 1.25)* 1.08 (0.96, 1.23) 1.08 (0.92, 1.27) 1.07 (0.87, 1.32) 1.12 (0.87, 1.45) 1.12 (0.84, 1.49) 1.81 (1.22, 2.67)* 1.58 (1.03, 2.44)* 1.30 (0.88, 1.93)
 Middle child 2773 0.94 (0.74, 1.19) 0.87 (0.67, 1.13) 0.90 (0.69, 1.19) 1.28 (1.04, 1.58)* 1.28 (1.01, 1.62)* 1.26 (1.03, 1.54)* 2.21 (1.71, 2.86)* 2.07 (1.39, 3.07)* 1.49 (0.99, 2.25)
 Youngest child 1293 1.33 (1.10, 1.62)* 1.37 (1.08, 1.73)* 1.42 (1.09, 1.84)* 1.70 (1.24, 2.34)* 1.52 (0.94, 2.46) 1.61 (0.97, 2.66) 2.08 (1.48, 2.92)* 2.38 (1.63, 3.48)* 1.87 (1.21, 2.88)*
Number of younger siblings
 None (only child) 22,746 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) 2077 1.14 (0.98, 1.31) 1.11 (0.94, 1.31) 1.13 (0.94, 1.35) 1.07 (0.80, 1.43) 1.13 (0.82, 1.56) 1.15 (0.79, 1.66) 1.24 (0.83, 1.85) 1.18 (0.78, 1.78) 1.11 (0.67, 1.84)
 Two or more (oldest child) 2533 1.14 (1.02, 1.29)* 1.06 (0.91, 1.24) 1.04 (0.85, 1.27) 1.06 (0.81, 1.38) 1.11 (0.83, 1.49) 1.09 (0.81, 1.46) 2.27 (1.46, 3.54)* 1.95 (1.13, 3.36)* 1.46 (0.88, 2.40)
Number of older siblings
 None (only child) 22,746 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) 1230 1.32 (1.08, 1.61)* 1.36 (1.07, 1.72)* 1.38 (1.05, 1.81)* 1.65 (1.21, 2.25)* 1.45 (0.89, 2.39) 1.60 (0.95, 2.67) 2.07 (1.41, 3.02)* 2.41 (1.59, 3.63)* 1.84 (1.15, 2.93)*
 Two or more (youngest child) 63 1.70 (0.94, 3.07) 1.80 (0.83, 3.90) 1.97 (0.91, 4.25) 2.96 (0.99, 8.85) 3.60 (1.20, 10.78)* 3.37 (1.12, 10.13)* 2.50 (0.76, 8.16) 2.21 (0.46, 10.55) 1.79 (0.38, 8.52)
  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