Table 2

Specific disease morbidity counts compared between case and control groups

Morbidity countOA cases No (%)Non-OA controls No (%)Unadjusted OR (95% CI)Adjusted OR* (95% CI)
*Odds ratio (OR) adjusted for age, sex, and social class.
Single1477 (13)2465 (21)1.001.00
Low (2 or 3)3478 (30)4232 (36)1.37 (1.27 to 1.48)1.36 (1.26 to 1.47)
Medium (4 or 5)2910 (26)2643 (22)1.84 (1.69 to 2.00)1.81 (1.66 to 1.97)
High (6 or more)3510 (31)2440 (21)2.40 (2.11 to 2.61)2.35 (2.16 to 2.55)