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J Epidemiol Community Health 63:366-372 doi:10.1136/jech.2008.080820
  • Research report

Body mass index and health-related behaviours in a national cohort of 87 134 Thai open university students

Table 1 Sociodemographic factors and obesity†
Frequency distribution, % Crude OR Adjusted OR (95% CI) p Value for trend
Income (Baht)
    ⩽7000 42 1 1 0.003
    7001–10 000 23 1.23 0.95 (0.90 to 1.01)
    10 001–20 000 24 2.21 1.12 (1.06 to 1.19)
    ⩾20 000 11 3.17 1.10 (1.01 to 1.18)
(100%)
Education
    ⩽High school 49 1 1 NS*
    Diploma 27 0.88 1.01 (0.96 to 1.06)
    University 24 1.09 0.96 (0.91 to 1.01)
(100%)
Marital status
    Single 43 1 1 <0.001
    Partnered 57 2.5 1.31 (1.25 to 1.37)
(100%)
Chinese ethnicity
    No 72 1 1 <0.001
    Yes 28 1.3 1.13 (1.08 to 1.18)
(100%)
Region
    Bangkok 17 1 1 –‡
    Central 24 0.95 1.04 (0.98 to 1.11)
    North 18 0.92 0.95 (0.88 to 1.02)
    North-East 21 0.91 0.90 (0.84 to 0.96)
    East 6 0.85 0.90 (0.82 to 0.99)
    South 13 0.82 0.91 (0.84 to 0.99)
(100%)
Urbanisation status§
    Rural–rural (RR) 44 1 1 <0.001
    Rural–urban (RU) 32 1.07 0.94 (0.89 to 0.99)
    Urban–rural (UR) 4 1.68 1.42 (1.29 to 1.55)
    Urban–urban (UU) 20 1.61 1.47 (1.38 to 1.55)
(100%)
  • †Risk of obesity expressed as odds ratios (ORs). Adjusted ORs were derived from a logistic regression model which included age, sex and all six sociodemographic factors.

  • *NS, not significant.

  • ‡p value for trend not computed—no natural ordering.

  • §Location of residence (rural, R, or urban, U) when 10–12 years old and in 2005. For example, RU is rural residence when 10–12 years old and urban in 2005.

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