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Table 2 Demographic characteristics of trivalent influenza vaccine (TIV) completed, partial and non-vaccinated households during the three consecutive years of influenza seasons (2008–2011)

From: Geographical heterogeneity and influenza infection within households

  1st Year   2nd Year   3rd Year  
  TIV(-) TIV(+) p TIV(-) Partial TIV TIV(+) p TIV(-) Partial TIV TIV(+) p
No of household  
Household size# 3.28 3.45   4.2 7.46 3.84   3.76 7.50 4.12  
  (3.00,3.58) (3.18,3.72)   (3.83,4.64) (6.51,8.40) (3.35,4.34)   (3.15,4.36) (6.06,8.94) (3.70,4.54)  
Location of residence            
  Taichung 28(0.47) 22(0.38)   34(0.30) 15(0.43) 29(0.51) * 20(0.49) 9(0.45) 35(0.30) *
  Nantou 31(0.53) 43(0.62)   80(0.70) 20(0.57) 28(0.49)   21(0.51) 11(0.55) 80(0.70)  
Participants  
Gender            
  Male 31(0.53) 34(0.52)   71(0.52) 33(0.47) 31(0.48)   19(0.41) 21(0.49) 75(0.54)  
  Female 28(0.47) 31(0.48)   66(0.48) 37(0.53) 33(0.52)   27(0.59) 22(0.51) 65(0.46)  
Age (average years)# 9.24 8.00 * 9.39 9.20 9.11   10.80 9.65 9.66 *
  (8.83,9.64) (7.64,8.36)   (9.10,9.68) (8.75,9.65) (8.76,9.45)   (10.24,11.37) (9.04,10.26) (9.39,9.94)  
Household contacts  
Gender            
  Male 60(0.44) 63(0.40)   152(0.44) 78(0.44) 55(0.40)   40(0.37) 45(0.42) 142(0.44)  
  Female 75(0.56) 96(0.60)   192(0.56) 100(0.56) 84(0.60)   68(0.63) 61(0.58) 181(0.56)  
Age            
  <18 37(0.27) 43(0.27)   80(0.23) 45(0.25) 15(0.11) * 31(0.29) 32(0.30) 74(0.23)  
  ≥18 98(0.73) 116(0.73)   264(0.77) 133(0.75) 124(0.89)   77(0.71) 74(0.70) 249(0.77)  
Age (average years)# 34.35 33.51   36.84 36.19 40.22   35.47 31.81 36.49  
  (31.46,37.24) (30.82,36.20)   (34.91,38.77) (33.51,38.87) (37.58,42.85)   (31.79,39.16) (28.63,34.99) (34.55,38.43)  
Vaccinated in previous year            
  Yes 9(0.07) 29(0.18)   7(0.02) 21(0.12) 23(0.17) * 16(0.15) 18(0.17) 68(0.21)  
  No 126(0.93) 130(0.82)   337(0.98) 157(0.88) 116(0.83)   92(0.85) 88(0.83) 255(0.79)  
  1. *p < 0.05.
  2. #Numbers in brackets are 95 % confidence interval calculated by GEE method.