Table 2.

Descriptive statistics of study population stratified by radiotherapy (n = 1,884,469).

	Radiotherapy		No radiotherapy	p-value
	n	%	n	%
Total	809,879	43.0%	1,074,590	57.0%	–
Secondary sarcoma	242	0.03%	117	0.01%	<0.001
Age at first diagnosis, yr
18–44	109,778	13.6%	139,365	13.0%
45–59	250,317	30.9%	339,011	31.6%	<0.001
60–74	344,198	42.5%	437,789	40.7%
75+	105,586	13.0%	158,425	14.7%
Year of first diagnosis
1973–1998	198,715	24.5%	330,866	30.8%
1999–2003	219,079	27.1%	253,002	23.5%	<0.001
2004– 2007	195,714	24.2%	234,668	21.8%
2008–2011	196,371	24.3%	256,054	23.8%
Female gender	477,563	59.0%	602,036	56.0%	<0.001
Race
White	665,435	82.6%	885,342	83.5%
Black	83,098	10.3%	105,649	10.0%	<0.001
Other	57,059	7.1%	69,836	6.6%
Stage
Local	348,742	43.0%	521,821	48.6%	<0.001
Regional	461,137	57.0%	552,769	51.4%