Table 2

Model odds ratios and percentage of variation explained.a

Model 1 OR (95% CI)Model 2 OR (95% CI)Model 3 OR (95% CI)Model 4 OR (95% CI)
Age (years)
 0–151.01.0
 16–341.9 (1.9 to 2.0)1.4 (1.4 to 1.4)
 35–642.5 (2.5 to 2.5)1.4 (1.4 to 1.5)
 ≥653.2 (3.2 to 3.3)1.2 (1.1 to 1.2)
Sex
 Male1.01.0
 Female1.5 (1.4 to 1.5)1.1 (1.1 to 1.1)
Morbidity
 1 (healthiest)1.01.0
 25.4 (5.2 to 5.5)5.4 (5.3 to 5.6)
 39.3 (9.0 to 9.5)9.2 (8.9 to 9.4)
 418.2 (17.8 to 18.7)17.4 (16.9 to 17.8)
 527.4 (26.6 to 28.3)26.3 (25.5 to 27.1)
 6 (least healthy)36.2 (35.3 to 37.1)35.3 (34.3 to 36.3)
Variation%%%%
Total variance explained05.330.430.8
Total variance unexplained
 at practice level4.64.53.63.6
 at patient level95.490.266.165.6
  • a OR = Odds ratio.