Table 1.

Characteristics of population-based cohort of 11,571 patients first diagnosed as uterine cancer (ICD-9: 179, 182) in Taiwan 1979-2008

	All	<50 years olda	≥50 years olda
No. with uterine cancer	11,571	4,445 (38.42 %)	7,126 (61.58 %)
No. who developed a SPM (%)	555 (4.80 %)	163 (3.67 %)	392 (5.50 %)
Average age at diagnosis of uterine cancer ± SD (years)	52.93 ± 11.69	41.63 ± 6.22	59.98 ± 8.26
Average age at diagnosis of SPM ± SD (years)	61.23 ± 11.78	48.59 ± 8.57	66.50 ± 8.49
Average interval between first and second cancers ± SD (years)	6.27 ± 5.53	6.61 ± 5.68	6.14 ± 5.47
Average follow-up (years)	6.05 ± 5.55	7.00 ± 5.84	5.46 ± 5.27

SD standard deviation, SPM second primary malignancy

^aAge at uterine cancer diagnosis. An age of 50 years was selected for comparison as this is the average menopausal age in Taiwanese women