Table 1.

Age-related prevalence of trapeziometacarpal arthrosis (n = 2321)

Age group (years)	Patients per Sodha grade
	Grade 1		Grade 2		Grade 3		Grades 2 and 3
	Number	Prevalence (95% CI)	Number	Prevalence (95% CI)	Number	Prevalence (95% CI)	Number	Prevalence (95% CI)
31–40	251	94 (92–97)	15	6 (3–8)	0	0 (0–0)	15	6 (3–8)
41–50	356	83 (80–87)	68	16 (12–19)	4	1 (0.02–1.8)	72	17 (13–20)
51–60	311	55 (51–59)	244	43 (39–47)	14	2 (1.2–3.7)	258	45 (41–49)
61–70	156	36 (32–41)	223	52 (47–56)	53	12 (9–15)	276	64 (59–68)
71–80	51	15 (11–19)	205	61 (56–67)	78	23 (19–28)	283	85 (81–89)
81–90	22	9 (5–12)	143	57 (51–63)	87	35 (29–40)	230	91 (88–95)
> 90	2	5 (−2–12)	20	50 (34–66)	18	45 (29–61)	38	95 (88–102)

CI = confidence interval.