Table 5

Quantile regression coefficients analysis for estimated BMI change based on history of smoking, alcohol misuse and sociodemographic factors and length of incarceration

Variables10th percentile (CI)25th percentile (CI)50th percentile (CI)75th percentile (CI)90th percentile (CI)
Ex-smokerYes0 (reference)0 (reference)0 (reference)0 (reference)0 (reference)
No−0.94 (−1.96 to 0.52)−0.6 (−1.87 to 0.1)−0.61 (−1.81 to 0.20)−1.64* (−2.72 to −0.60)−2.3* (−4.92 to −0.83)
Number of cigarettes smoked per day≤100 (reference)0 (reference)0 (reference)0 (reference)0 (reference)
>10≤250.2 (−0.9 to 1.1)0.3 (−0.8 to 0.9)0.8 (−0.2 to 1.2)0.2 (−1.5 to 1.0)−0.4 (−2.5 to 1.1)
>252.4 (−1.3 to 1.4)0.5 (−1.0 to 1.9)1.2 (−0.8 to 2.8)0.4 (−0.8 to 1.7)−0.25 (−3.1 to 2.2)
Alcohol misuseYes0 (reference)0 (reference)0 (reference)0 (reference)0 (reference)
No0.7 (−0.0 to 2.0)0.9* (0.12 to 1.65)1.17* (0.24 to 1.90)1.32* (0.42 to 2.05)1.65 (−0.75 to 3.07)
SexMale0 (reference)0 (reference)0 (reference)0 (reference)0 (reference)
Female−1.7* (−3.0 to −0.6)−0.7 (−2.1 to 0.7)−0.14 (−0.68 to 0.58)1.44 (−0.80 to 3.05)2.88* (1.29 to 7.14)
Age (years)18≤240.7* (0.0 to 2.9)−0.3 (−2.3 to 2.5)−2.39 (−4.16 to 0.22)−2.41* (−5.91 to −0.69)−2.38 (−5.47 to 0.97)
≥25≤340.4 (−0.3 to 6.9)−0.7 (−2.5 to 2.4)−1.89 (−3.36 to 0.40)−2.2* (−5.06 to −0.44)−2.93* (−5.58 to −0.32)
≥35≤440.8* (0.2 to 7.4)−0.2 (−2.2 to 2.7)−1.7 (−3.22 to 0.77)−2.31* (−5.31 to −0.40)−1.6 (−4.49 to 0.96)
≥45≤641.0 (−0.2 to 7.4)−0.6 (−2.3 to 2.3)−1.04 (−2.50 to 1.56)−0.79 (−3.43 to 0.66)−0.9 (−3.27 to 1.40)
≥650 (reference)0 (reference)0 (reference)0 (reference)0 (reference)
EthnicityCaucasian0 (reference)0 (reference)0 (reference)0 (reference)0 (reference)
Black0.2 (−1.3 to 1.4)0.3 (−0.6 to 1.5)0.36 (−0.34 to 0.96)−0.04 (−0.90 to 1.26)−0.15 (−1.78 to 2.11)
Aboriginal−0.4 (−2.2 to 1.4)0.8 (−0.4 to 1.7)1.21 (−0.50 to 2.06)1.32* (0.57 to 2.32)0.88 (−0.56 to 2.54)
Other−0.2 (−2.5 to 0.5)0.1 (−1.6 to 0.7)−0.46 (−1.28 to 0.43)−1.07* (−1.54 to −0.03)−1.98 (−3.19 to 0.69)
Length of incarceration≤18 months0 (reference)0 (reference)0 (reference)0 (reference)0 (reference)
>18 months ≤5 years−0.3 (−0.8 to 0.5)−0.1 (−0.9 to 0.8)−0.34 (−0.92 to 0.32)−0.22 (−0.70 to 0.46)−0.28 (−1.52 to 0.55)
>5 years−0.9 (−1.5 to 0.0)0.2 (−0.8 to 1.2)0.64 (−0.26 to 1.64)1.57* (0.56 to 2.60)1.93* (0.70 to 3.68)
  • The results presented were adjusted for the factors seen in the table and other factors (language, feeding system, physical activity and diet) (data not shown in the table).

  • *P<0.05 was considered statistically significant.

  • BMI, body mass index.