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Table 2 Factors associated with EV infection in index cases

From: Transmission and serotype features of hand foot mouth disease in household contacts in Dong Thap, Vietnam

Characteristics Laboratory confirmedx
(n=113)
Not Laboratory confirmed
(n=37)
Crude RR
[cRR]
95% CI
[CI]
P-value
Sex
 Female 50 (71) 20 (29) 1.00 [0.63,  
 Male 63 (79) 17 (21) 0.91 1.31] 0.61
Age
 <1 year 32 (72) 12 (28) 1.00   
 1-<3 years 71 (78) 20 (22) 1.07 [0.71, 1.63] 0.74
 3+ years 10 (67) 5 (33) 0.92 [0.45, 1.86] 0.81
Household size!
 <5 44 (73) 16 (27) 1.00   
 ≥5 69 (77) 21 (23) 1.05 [0.72, 1.53] 0.82
Number of children in household
 <2 84 (76) 26 (24) 1.00   
 2+ 29 (73) 11 (27) 0.95 [0.62, 1.45] 0.81
Toy sharing~
 No 84 (78) 24 (22) 1.00   
 Yes 29 (69) 13 (31) 1.13 [0.74, 1.72] 0.58
Boiled water
 No 13 (75) 4 (25) 1.00   
 Yes 100 (75) 33 (25) 1.02 [0.57, 1.81] 0.95
Homemade food
 No 39 (83) 8 (17) 1.00   
 Yes 74 (72) 29 (28) 1.15 [0.78, 1.70] 0.47
  1. X Defined as a positive RT-PCR, or a 4-fold change in a single EV-A71, CV-A6, CV-A16 (or more) serotype neutralizing antibody titers between sample 1 and sample 2.
  2. ! Mean household size 5 people.
  3. ~ Defined as either index case or household contact (≤15yrs) stating yes to toy sharing.
  4. Values expressed as number (percentage within exposure group) unless otherwise indicated