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Table 3 Multilevel logistic regression analyses across obesity definitions among children participating in the Irish COSI study

From: School sociodemographic characteristics and obesity in schoolchildren: does the obesity definition matter?

  All children (n = 7542) Boys (n = 3476) Girls (n = 4066)
Younger boys (n = 1701) Older boys (n = 1775) Younger girls (n = 2080) Older girls (n = 1986)
ORa 95% CI p-value* ORa 95% CI p-value* ORa 95% CI p-value* ORa 95% CI p-value* ORa 95% CI p-value*
WHO 2007
 Sex (ref. boy) 1.04 0.93–1.15 0.515
 Age (ref. young children) 0.83 0.79–0.91 < 0.001
 School SES (ref. non-disadvantaged schools) 1.50 1.25–1.79 < 0.001 1.13 0.82–1.57 0.449 1.58 1.14–2.17 0.005 1.68 1.21–2.34 0.002 1.72 1.26–2.33 0.001
 School urbanisation(ref. urban) 1.04 0.89–1.22 0.627 1.16 0.88–1.53 0.297 1.08 0.82–1.41 0.595 1.07 0.79–1.44 0.674 0.90 0.68–1.20 0.482
 Measurement round 0.83 0.77–0.89 < 0.001 0.78 0.68–0.88 < 0.001 0.75 0.60–0.92 0.006 0.85 0.75–0.95 0.004 0.98 0.80–1.19 0.811
CDC 2000
 Sex (ref. boy) 1.14 1.01–1.28 0.032
 Age (ref. young children) 0.85 0.75–0.95 0.005
 School SES (ref. non-disadvantaged schools) 1.59 1.29–1.95 < 0.001 1.20 0.85–1.71 0.306 1.79 1.25–2.55 0.001 1.89 1.30–2.74 0.001 1.77 1.23–2.53 0.002
 School urbanisation(ref. urban) 1.02 0.85–1.23 0.828 1.03 0.75–1.40 0.867 0.94 0.69–1.30 0.717 1.19 0.85–1.67 0.313 0.96 0.69–1.33 0.788
 Measurement round 0.82 0.75–0.88 < 0.001 0.76 0.66–0.88 < 0.001 0.76 0.60–0.96 0.020 0.81 0.72–0.92 0.001 0.98 0.78–1.22 0.832
IOTF
 Sex (ref. boy) 1.37 1.21–1.54 < 0.001
 Age (ref. young children) 0.89 0.79–1.00 0.054
 School SES (ref. non-disadvantaged schools) 1.60 1.30–1.96 < 0.001 1.15 0.80–1.65 0.457 1.73 1.22–2.47 0.002 1.91 1.31–2.77 0.001 1.83 1.29–2.60 0.001
 School urbanisation(ref. urban) 1.08 0.90–1.30 0.412 1.22 0.89–1.66 0.217 1.02 0.74–1.40 0.913 1.21 0.86–1.69 0.277 0.96 0.69–1.33 0.789
 Measurement round 0.84 0.77–0.92 < 0.001 0.77 0.67–0.89 0.001 0.80 0.63–1.02 0.075 0.85 0.75–0.97 0.012 0.98 0.79–1.22 0.853
UK 1990
 Sex (ref. boy) 1.60 1.42–1.79 < 0.001
 Age (ref. young children) 0.30 0.26–0.35 < 0.001
 Height (cm) 1.11 1.10–1.12 < 0.001 1.15 1.12–1.17 < 0.001 1.09 1.08–1.11 < 0.001 1.14 1.12–1.16 < 0.001 1.09 1.08–1.11 < 0.001
 School SES (ref. non-disadvantaged schools) 1.40 1.10–1.77 0.006 1.35 0.95–1.92 0.095 1.56 1.09–2.24 0.016 1.61 1.04–2.50 0.032 1.44 0.96–2.14 0.075
 School urbanisation(ref. urban) 1.12 0.91–1.38 0.276 1.39 1.03–1.88 0.030 1.06 0.78–1.43 0.715 1.04 0.71–1.52 0.848 1.16 0.82–1.62 0.397
 Measurement round 0.58 0.54–0.63 < 0.001 0.52 0.45–0.61 < 0.001 0.58 0.45–0.74 < 0.001 0.56 0.49–0.64 < 0.001 0.61 0.49–0.77 < 0.001
WHeR
 Sex (ref. boy) 1.17 1.02–1.36 0.031
 Age (ref. young children) 0.92 0.80–1.06 0.237
 School SES (ref. non-disadvantaged schools) 1.46 1.12–1.89 0.005 1.40 0.93–2.10 0.108 1.78 1.14–2.79 0.011 1.52 0.98–2.34 0.059 1.46 0.94–2.27 0.093
 School urbanisation(ref. urban) 1.23 0.98–1.54 0.078 1.27 0.87–0.98 0.191 1.05 0.71–1.55 0.817 1.22 0.83–1.80 0.306 1.43 0.98–2.09 0.068
 Measurement round 0.79 0.98–1.54 < 0.001 0.82 0.69–0.98 0.025 0.77 0.58–1.01 0.063 0.75 0.65–0.87 < 0.001 0.79 0.61–1.04 0.092
  1. aAdjusted for random effects at school level
  2. *p-values in bold font are significant after correcting for multiple testing with the Benjamini- Hochberg False Discovery Rate [34]
  3. Younger children < 10.5 years; older children ≥10.5 years
  4. CDC Centers for Disease Control and Prevention, CI confidence interval, IOTF International Obesity Task Force, OR odds ratio, SES socioeconomic status, UK United Kingdom, WHeR waist-to-height ratio, WHO World Health Organisation