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Table 2 Weighted* multivariate logistic regression (Odds Ratio, OR, and 95% confidence interval, 95% CI) models.

From: Body piercing and tattoo: awareness of health related risks among 4,277 Italian secondary school adolescents

INDEPENDENT
VARIABLES 		  OUTCOME VARIABLES
   (1)
OR (95% CI) 		(2)
OR (95% CI) 		(3)
OR (95% CI) 		(4)
OR (95% CI)
Gender Female Reference Reference Reference Reference
  Male 0.78 (0.66, 0.94) 0.54 (0.44, 0.65) 0.56 (0.48, 0.66) 0.71 (0.59, 0.86)
Age <16 years     Reference
  17-18 years     1.01 (0.60, 1.72)
  19+ years     0.57 (0.28, 1.16)
School year 1st Reference Reference Reference Reference
  3rd 1.89 (2.54, 3.79) 1.54 (1.27, 1.87) 1.32 (1.11, 1.57) 1.03 (0.61, 1.74)
  5th 3.10 (2.54, 3.79) 2.29 (1.84, 2.85) 1.70 (1.41, 2.04) 1.99 (0.97, 4.08)
Province of residence Belluno Reference Reference Reference Reference
  Verona 1.03 (0.77, 1.37) 0.76 (0.55, 1.04) 1.30 (0.98, 1.72) 1.04 (0.76, 1.41)
  Vicenza 0.82 (0.59, 1.16) 0.61 (0.43, 0.87) 0.54 (0.40, 0.73) 0.90 (0.64, 1.28)
  Padua 0.90 (0.68, 1.19) 0.92 (0.67, 1.26) 1.02 (0.78, 1.33) 1.07 (0.79, 1.45)
  Venice 0.91 (0.67, 1.23) 0.76 (0.54, 1.06) 1.06 (0.79, 1.41) 1.07 (0.77, 1.47)
  Treviso 0.91 (0.68, 1.22) 1.24 (0.88, 1.74) 1.00 (0.76, 1.33) 0.83 (061, 1.12)
  Rovigo 0.63 (0.47, 0.85) 0.73 (0.54, 1.01) 0.84 (0.64, 1.10) 0.69 (0.51, 0.93)
No. of siblings 0   Reference Reference  
  1   0.82 (0.65, 1.03) 0.87 (0.72, 1.06)  
  2+   0.63 (0.48, 0.82) 0.79 (0.63, 0.99)  
Tattoo Indifferent/not interested Reference   Reference Reference
  Interested/keen to try 0.88 (0.73, 1.05)   1.11 (0.94, 1.32) 1.07 (0.88, 1.28)
  Done 0.60 (0.42, 0.86)   1.02 (0.72, 1.43) 0.68 (0.48, 0.95)
Piercing Indifferent/not interested Reference   Reference Reference
  Interested/keen to try 0.91 (0.74, 1.12)   0.82 (0.67, 0.99) 0.86 (0.69, 1.07)
  Done 1.03 (0.81, 1.30)   0.62 (0.50, 0.77) 0.37 (0.29, 0.46)
  1. (1) = Knowledge of infectious disease risk. Model fitted on 2,678 complete observations
  2. (2) = Knowledge of hygienic norms mandatory in tattoo parlours. Model fitted on 3,093 complete observations
  3. (3) = Propensity to refer to a certified parlour to undergo body art. Model fitted on 3,341 complete observations
  4. (4) = Propensity to seek medical advice in the event of complications related to body art. Model fitted on 3,341 complete observations
  5. * ORs weighted for sex and age to make the results more representative of the adolescents of the Veneto Region aged 14 to 22 years
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