TABLE 1 

Demographic information for subjects in each experimental group

CharacteristicValue for:P value
Cases (n = 94)Diarrheal controls
(n = 89)
Nondiarrheal controls
(n = 155)
Sex, n (%)
    Females53 (56.4)49 (55.1)102 (65.8)
    Males41 (43.6)40 (44.9)53 (34.2)0.166
Age (yr)
    Mean (SD)55.9 (18.3)58.7 (14.9)52.2 (21.5)0.034
    Range18-8918-8519-88
Race, n (%)0.712
    White84 (89.4)76 (85.4)129 (83.2)
    Black7 (7.4)9 (10.1)16 (10.3)
    Other/unknown3 (3.2)4 (4.5)10 (6.5)
Wt, mean no. of lbs (SD)169.9 (56.9)177.9 (54.5)171.5 (47.3)0.549
Vegetarian, n (%)2 (2.1)5 (5.6)8 (5.2)0.435
Drug use, n (%)
    Antibiotics (<3 mo)72 (76.6)56 (62.9)21 (13.5)<0.001
    Fluoroquinolone21 (22.3)17 (19.1)4 (2.6)<0.001
    Amoxicillin10 (10.6)6 (6.7)7 (4.5)0.182
    Cephalosporin11 (11.7)3 (3.4)3 (1.9)0.004
    Clindamycin2 (2.1)05 (3.2)0.297
    Ampicillin1 (1.1)000.541
Other factors, n (%)
    Antacid use for <30 days20 (21.3)20 (22.5)11 (7.1)0.001
    Surgery within the previous 6 mo48 (51.1)38 (42.7)14 (9.0)<0.001
    History of C. difficile1 (1.1)2 (2.2)4 (2.6)0.793
    Residing with person with CDI1 (1.1)2 (2.2)1 (0.6)0.593
    Residing with health care worker25 (26.6)13 (14.6)17 (11.0)0.005