Risk of Type 2 Diabetes among Osteoarthritis Patients in a Prospective Longitudinal Study

Table 1

Distribution of variables by exposure (osteoarthritis) status and unadjusted relative risks (RRs) of diabetes observed in the prospective analysis.

Variable	No osteoarthritis; ( = 19,089)	Osteoarthritis; ( = 19,089)	Unadjusted; RR (95% CI)
Diabetes	11.0	16.4	1.32 (1.25–1.39)
Sex (women)	60.4	60.4	1.01 (1.01-1.01)
Age (year)
20–39	8.8	8.8	Reference
40–49	12.4	12.4	2.00 (1.72–2.32)
50–59	19.5	19.5	2.83 (2.47–3.25)
60–69	26.0	26.0	2.96 (2.59–3.39)
70–79	23.6	23.6	2.50 (2.17–2.87)
80+	9.8	9.8	1.76 (1.45–2.14)
Socioeconomic status
1 (low)	23.1	23.5	1.40 (1.28–1.53)
2	21.5	21.8	1.36 (1.24–1.49)
3	18.4	18.9	1.28 (1.17–1.40)
4	18.3	18.4	1.13 (1.03–1.24)
5 (high)	18.8	17.4	Reference
Obesity	5.4	11.8	2.00 (1.86–2.16)
COPD	16.0	24.4	1.28 (1.20–1.37)
Hypertension	31.5	40.2	1.92 (1.82–2.03)
Hyperlipidemia	9.3	11.4	1.44 (1.33–1.55)
Charlson score; mean (SD)	0.94 (1.83)	1.07 (1.58)	1.06 (1.04–1.08)

The numbers are percent unless otherwise mentioned. OA: osteoarthritis; COPD: chronic obstructive pulmonary disease.