Factor | Category | Cases n = 31 (%) | Control n = 62 (%) | OR (95% CI) | p-value |
Friend contact | Yes No | 20 (64.5) 11 (35.5) | 15 (24.2) 47 (75.8) | 5.6 (2.2 - 14.5) | <0.01 |
Classmate contact | Yes No | 18 (58.1) 13 (41.9) | 14 (22.6) 48 (77.2) | 4.7 (1.8 - 12.0) | <0.01 |
Roommate contact | Yes No | 21 (67.7) 10 (32.3) | 21 (33.9) 41 (66.1) | 4.1 (1.6 - 10.3) | <0.01 |
Sharing clothes | Yes No | 11 (35.5) 20 (64.5) | 9 (14.5) 53 (85.5) | 3.2 (1.2 - 9.0) | 0.015 |
Dormitory size | Yes No | 23 (74) 8 (26) | 33 (53.0) 29 (47.0) | 2.5 (1.0 - 6.5) | 0.05 |
History of varicella like rash | Yes No | 5 (16.1) 26 (83.9) | 40 (64.5) 22 (35.5) | 0.1(0.04 - 0.31) | <0.01 |