Table 1.

Incidence and Prevalence of Osteoarthritis Among 12 Retrospective Cohort Studies Extended on Next Page

					Tactical Athletes
Study (Year)	Sex(es)	Age Range, y	Type of Osteoarthritis	Outcome	Osteoarthritis	No Osteoarthritis	Total	Incidence/ Prevalence
Firefighters
Vingard et al21 (1991)	Male	38–78	Knee	Cumulative index	8	1232	1240	0.65%
	Male	38–78	Hip	Cumulative index	11	1229	1240	0.89%
Active-duty US military
Cameron et al22 (2011)	Both	20–24	Any	Incidence rate	12 859	4 549 717	4 562 576	2.82a
	Both	25–29	Any	Incidence rate	14 260	2 855 135	2 869 395	4.97a
	Both	30–34	Any	Incidence rate	15 446	1 995 313	2 010 759	7.68a
	Both	35–39	Any	Incidence rate	25 721	1 784 737	1 810 458	14.21a
	Both	≥40	Any	Incidence rate	37 950	1 372 453	1 410 403	26.91a
Scher et al23 (2009)	Male	20–29	Hip	Incidence rate	713	5 425 162	5 425 875	13.14b
	Male	30–39	Hip	Incidence rate	1129	3 021 556	3 022 685	37.35b
	Male	40–49	Hip	Incidence rate	1425	1 074 946	1 076 371	132.39b
	Male	20–49	Hip	Incidence rate	3267	9 521 664	9 524 931	34.30b
	Female	20–29	Hip	Incidence rate	302	1 015 238	1 015 540	29.73b
	Female	30–39	Hip	Incidence rate	299	406 951	407 250	73.42b
	Female	40–49	Hip	Incidence rate	296	151 358	151 654	195.18b
	Female	20–49	Hip	Incidence rate	897	1 573 547	1 574 444	56.97b
Veteran military parachutists
Murray-Leslie et al24 (1977)	Male	23–70	Knee	Prevalence	19	27	46	41.30%
Murray-Leslie et al25 (1977)	Male	23–70	Lumbar	Prevalence	39	7	46	84.80%
Active-duty military pilots
Aydog et al26 (2004)	Male	31–35	Cervical	Prevalence	31	219	250	12.40%
	Male	31–35	Lumbar	Prevalence	18	232	250	7.20%
Mandatory national military service
Kujala et al27 (1994)	Male	21–85	Knee	Prevalence	18	1385	1403	1.30%
	Male	21–85	Hip	Prevalence	20	1383	1403	1.40%
	Male	21–85	Ankle	Prevalence	0	1403	1403	0.00%
Kujala et al28 (1999)	Male	47–71	Hip	Prevalence	13	166	179	7.30%
	Male	47–71	Knee	Prevalence	19	160	179	10.60%
Kettunen et al29 (2006)	Male	38–86	Knee	Prevalence	119	388	507	23.50%
	Male	38–86	Hip	Prevalence	80	400	480	16.67%
Kettunen et al30 (2001)	Male	47–99	Hip	Prevalence	81	400	481	16.80%
	Male	47–99	Knee	Prevalence	120	388	508	23.60%
Sarna et al31 (1997)	Male	NA	Ankle, knee, and hip	Prevalence	36	1676	1712	2.10%
Iosifidis et al32 (2015)	Male	50–51	Ankle, knee, and hip	Prevalence	39	124	163	23.90%

Abbreviation: NA, not able to calculate due to lack of observed cases.

^aIncidence rate per 1000 person-years.

^bIncidence rate per 100 000 person-years.