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Table 3 The number of varicella cases pre- and post-intervention

From: An economic analysis of varicella immunization in the Singapore military

Demographics Number of cases P-value
Pre-intervention (Dec 2007 - Nov 2010) Post-intervention (Dec 2010 to Dec 2013)
Sex
 Female 10 (3.2) 2 (1.6) 0.357
 Male 301 (96.8) 122 (98.4) 0.357
Race
 Chinese 233 (74.9) 102 (82.3) 0.101
 Malay 23 (7.4) 7 (5.6) 0.515
 Indian 28 (9.0) 11 (8.9) 0.965
 Others 27 (8.7) 4 (3.2) 0.046*
Job
 NSF 242 (77.8) 87 (70.2) 0.093
 Non-NSF 69 (22.2) 37 (29.8) 0.093
Age
 <20 71 (22.8) 13 (10.5) 0.003*
 20-22 172 (55.3) 70 (56.5) 0.828
 23-25 25 (8.0) 11 (8.9) 0.776
 26-30 16 (5.1) 12 (9.7) 0.082
 31-35 15 (4.8) 13 (10.5) 0.030*
 36+ 12 (3.9) 5 (4.0) 0.933
Medical Leave (Workdays)
 0-2 days 90 (28.9) 38 (30.6) 0.724
 1 week 115 (37.0) 46 (37.1) 0.981
 >1 week 106 (34.1) 40 (32.3) 0.716
  1. Numbers in brackets are the proportion of cases within that category, given as a percentage. The P-value is calculated as a 2-tailed t-test of proportions between categories. “Other Race” includes minority races in Singapore, such as Boyanese, Bugis, Burmese, Caucasian, Ceylonese, Eurasian, Javanese, Nepalese and Sikh. “NSF” refers to Full Time National Servicemen, who are male Singaporeans that are conscripted into the military under the Enlistment Act