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Table 1: 
Patient characteristics in centers with low (group A) and high (group B) numbers of cases/hospital
Group A (n = 171) Group B (n = 478) P Value
No. % No. %
Sex ratio 
    Women 122 71.3% 346 72.4% .80
    Men 49 28.7% 132 27.6% 
Age 
    Mean (yr) 52.1 ± 12.2 50.8 ± 11.0 .21
    Range (yr) 22–80 23–83 
HTA 51/168^a 30.4% 141/468^a 30.1% .95
Smokers 62/167^a 37.1% 198/470^a 42.1% .25
 
a The information was not available in some cases.

	Group A (n = 171)		Group B (n = 478)		P Value
	No.	%	No.	%	P Value
Sex ratio
Women	122	71.3%	346	72.4%	.80
Men	49	28.7%	132	27.6%
Age
Mean (yr)	52.1 ± 12.2		50.8 ± 11.0		.21
Range (yr)	22–80		23–83
HTA	51/168^a	30.4%	141/468^a	30.1%	.95
Smokers	62/167^a	37.1%	198/470^a	42.1%	.25