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Table 2 Comparison of the prevalence of eating disorder behaviors in 1998 and 2008: results of Chi-Square Tests and multivariate logistic regressions

From: The changing demographic profile of eating disorder behaviors in the community

  1998 (n = 3010) 2008 (n = 3034)     
  n(%) n(%) χ2 P OR(95% CI)† P
Objective binge eating       
 Males 38 (2.6) 61 (4.1) 5.29 0.02 1.91 (1.17 – 3.10) 0.01
 Females 42 (2.7) 88 (5.7) 16.71 < 0.001 2.53 (1.61 – 3.96) < 0.001
 Metropolitan 50 (2.4) 103 (4.6) 15.05 < 0.001 1.74 (1.15 – 2.64) 0.01
 Regional 30 (3.2) 46 (5.8) 6.82 0.01 1.95 (1.04 – 3.67) 0.04
 < median income 26 (2.3) 72 (5.7) 17.78 < 0.001 3.29 (1.88 – 5.77)c < 0.001
 > median income 47 (3.3) 51 (4.4) 2.28 0.13 1.26 (0.83 – 1.92) 0.28
 15-24 years 20 (3.8) 43 (8.7) 10.31 0.00 2.81 (1.39 – 5.69) 0.00
 25-44 years 41 (3.6) 53 (5.3) 3.95 0.05 1.39 (0.86 – 2.23) 0.18
 ≥ 45 years 19 (1.4) 54 (3.5) 12.53 < 0.001 1.90 (1.04 – 3.46) 0.04
Extreme dieting       
 Males 8 (0.5) 35 (2.4) 16.96 < 0.001 4.87 (2.14 – 11.09)a < 0.001
 Females 38 (2.5) 66 (4.3) 7.69 0.01 1.69 (1.09 – 2.63) 0.02
 Metropolitan 27 (1.3) 73 (3.3) 18.27 < 0.001 2.76 (1.64 – 4.65)b < 0.001
 Regional 19 (2.0) 28 (3.5) 3.69 0.06 1.25 (0.57 – 2.74)) 0.57
 < median income 10 (0.9) 42 (3.4) 16.89 < 0.001 6.31 (2.64 – 15.08)c < 0.001
 > median income 27 (1.9) 40 (3.5) 6.36 0.01 1.85 (1.13 – 3.05) 0.02
 15-24 years 19 (3.6) 22 (4.5) 0.43 0.51 1.67 (0.70 – 3.96) 0.25
 25-44 years 20 (1.7) 49 (4.9) 17.53 < 0.001 2.52 (1.46 – 4.37) 0.00
 ≥ 45 years 8 (0.6) 30 (1.9) 9.99 0.00 4.43 (1.68 – 11.70) 0.00
Purging       
 Males 2 (0.1) 7 (0.5) 2.75 0.10 6.15 (1.22 – 31.10)a 0.03
 Females 26 (1.7) 23 (1.5) 0.21 0.65 0.93 (0.48 – 1.80) 0.83
 Metropolitan 17 (0.8) 22 (1.0) 0.32 0.57 1.59 (0.75 – 3.37) 0.23
 Regional 11 (1.2) 7 (0.9) 0.35 0.55 0.64 (0.13 – 3.18) 0.58
 < median income 9 (0.8) 14 (1.1) 0.62 0.43 4.28 (1.20 – 15.26)c 0.03
 > median income 15 (1.0) 8 (0.7) 0.91 0.34 0.80 (0.34 – 1.89) 0.61
 15-24 years 11 (2.1) 6 (1.2) 1.22 0.27 1.88 (0.42 – 8.33) 0.41
 25-44 years 14 (1.2) 9 (0.9) 0.49 0.49 0.55 (0.21 – 1.49) 0.24
 ≥ 45 years 3 (0.2) 14 (0.9) 5.70 0.02 9.48 (1.21 – 74.51)d 0.03
  1. OR odds ratio; † multivariate logistic regressions included age, education, income, body mass index, employment, and country of birth as covariates; athe OR was significantly greater for males than for females; bthe OR was marginally greater for metropolitan versus regional participants; cthe OR was significantly greater for participants below compared to above the median income level; dthe OR was significantly greater for participants aged over 44 years compared to those aged 25 – 44 years.