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Table 1: 
Patient demographics and outcomes/indications for first examination in patients undergoing a single (nonrepeat) or serial (repeat) NCHCT examinations
Nonrepeat (n = 7198)Repeat (n = 962)P
Demographic information
 Proportion of men0.4780.486.973
 Age (yr)57.964.1<.001
Rate of positive findings on the first examination (%) (No.)4.3 (308)5.3 (51).16
 Proportion of men0.5220.529.995
 Age (yr)63.564.2.832
Indications for positive first examination (%) (No.)
 Altered mental status37.0 (114)31.4 (16).442
 Headache17.2 (53)19.6 (10).677
 Trauma17.2 (53)39.2 (20)<.001
 Other28.6 (88)9.8 (5).005