Table 3. Multivariate Cox proportional hazards analysis of overall survival of patients with uterine sarcoma, 1990–2008 (n = 1,137).

Variable	Group	People	Person-years	Deaths	HR	95% CI	p
Age(years)
	<30	48	305.2	10	0.84	0.44–1.60	0.60
	30–39	215	1317.8	47	0.90	0.64–1.27	0.54
	40–49	482	2718.4	111	1	Referent
	50–59	265	1097.3	132	2.55	1.98–3.28	<0.001
	60–69	86	334.8	51	3.53	2.52–4.93	<0.001
	≥ 70	41	143.8	24	3.30	2.11–5.15	<0.001
Period
	1990–1994	135	1067.2	41	1.27	0.88–1.83	0.20
	1995–1999	255	1833.4	100	1	Referent
	2000–2008	747	3016.6	234	1.52	1.08–2.14	0.015
Subtype
	ESS	278	1716.9	84	1	referent
	LGESS	135	624.2	5	0.13	0.05–0.32	<0.001
	LMS	670	3310.1	272	1.59	1.24–2.04	<0.001
	Adenosarcoma	54	266.0	14	0.83	0.47–1.46	0.52

HR: hazard ratio, CI: confidence interval, ESS: endometrial stromal sarcoma, LGESS: low grade endometrial stromal sarcoma, LMS: leiomyosarcoma.