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Table 2 Coefficients and 95 % confidence intervals (CI) of the multivariable linear, gamma and quantile models

From: Factors associated with overweight: are the conclusions influenced by choice of the regression method?

Variables Coefficient (95 % CI)
Gamma Linear Quantile
Quantile 0.25 Quantile 0.50 Quantile 0.75
Age 0.15 (0.14, 0.17) 0.15 (0.13, 0.17) 0.11 (0.09, 0.12) 0.14 (0.12, 0.16) 0.18 (0.16, 0.21)
Marital statusa
 With partner 0.59 (0.28, 0.90) 0.60 (0.26, 0.93) 0.43 (0.16, 0.79) 0.54 (0.23, 0.85) 0.76 (0.39, 1.14)
Race/colourb
 Brown −0.96 (−1.51, −0.42) −0.97 (−1.53, −0.41) −0.43 (−0.98, 0.12) −0.89 (−1.65, −0.14) −1.63 (−2.30, −0.96)
 White −1.19 (−1.71, −0.68) −1.23 (−1.76, −0.70) −0.73 (−1.21, −0.25) −1.28 (−2.03, −0.53) −1.86 (−2.50, −1.22)
Mother’s schoolingc
 9–11 years 0.21 (−0.13, 0.56) 0.21 (−0.17, 0.58) −0.10 (−0.40, 0.20) 0.27 (−0.09, 0.62) 0.21 (−0.19, 0.61)
 12 or more years 0.69 (0.26, 1.12) 0.80 (0.34, 1.26) 0.42 (0.02, 0.81) 0.34 (−0.09, 0.76) 0.78 (0.13, 1.43)
Domestic overloadd
 High 0.60 (0.27, 0.94) 0.63 (0.28, 0.98) 0.43 (0.11, 0.74) 0.61 (0.23, 0.99) 0.89 (0.48, 1.31)
Years worked at night 0.03 (0.01, 0.06) 0.03 (0.01, 0.06) 0.00 (−0.03, 0.02) 0.03 (−0.01, 0.06) 0.04 (0.01, 0.07)
Self-rated healthe
 Poor 1.52 (1.20, 1.85) 1.62 (1.28, 1.97) 1.12 (0.79, 1.45) 1.50 (1.12, 1.87) 1.75 (1.32, 2.19)
Consumption of fried foodf
 1–3×/month 1.00 (0.41, 1.58) 1.06 (0.42, 1.71) 0.93 (0.26, 1.61) 0.90 (0.25, 1.55) 0.99 (0.02, 1.96)
 1–3×/week 1.22 (0.64, 1.80) 1.27 (0.62, 1.91) 0.86 (0.20, 1.52) 0.95 (0.28, 1.63) 1.24 (0.24, 2.24)
 4–6×/week 1.41 (0.71, 2.11) 1.61 (0.84, 2.37) 1.02 (0.30, 1.74) 1.20 (0.38, 2.02) 1.55 (0.45, 2.65)
 Daily 1.50 (0.69, 2.32) 1.42 (0.53, 2.30) 0.82 (0.13, 1.51) 1.01 (0.17, 1.84) 2.14 (0.99, 3.29)
Physical inactivityg
 Yes 0.75 (0.42, 1.80) 0.80 (0.43, 1.15) 0.45 (0.17, 0.74) 0.78 (0.46, 1.10) 0.88 (0.49, 1.27)
BMI at age 20 years 0.93 (0.88, 0.99) 0.90 (0.81, 0.91) 0.84 (0.78, 0.90) 0.97 (0.92, 1.03) 1.09 (1.03, 1.16)
  1. Reference categories: a “Without partner”; b “Black”; c “0–8 years”; d “Low”; e “Good”; f “Never or less than 1×/month”; g “No”