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Table 1 Demographic data and status of anti-PT IgG antibodies in studied subjects

From: The seroepidemiology of Immunoglobulin G antibodies against pertussis toxin in China: a cross sectional study

Subgroup n Mean of anti-PT IgG and 95% CI (IU/mL) Pa Number of subjects (%) in concentrations of anti-PT IgG Pc
     <30IU/mL ≥30IU/mL ≥100IU/mL  
Total 1313 14.21(12.29-16.13)   1196(91.09%) 93(7.08%) 24(1.83%)  
Home location
City 660 14.51(11.43-17.58) 0.76 609(92.27%) 51(7.73%) 13(1.97%) 0.18
County 653 13.92(11.62-16.23)   587(89.89%) 66(10.11%) 11(1.68%)  
Gender        
Male 654 15.09(12.43-17.73) 0.37 589(90.06%) 65(9.94%) 15(2.29%) 0.14
Female 659 13.35(10.57-16.12)   607(92.11%) 52(7.89%) 9(1.36%)  
Age (average age)
0-2(1.94) 80 10.91(7.01-14.82) 0.55 72(90%) 8(10.0%) 1(1.25%) 0.44
3-4(4.2) 79 9.95(5.74-14.17)   75(94.94%) 4(5.06%) 1(1.26%)  
5-6(5.8) 79 10.80(4.95-16.65)   75(94.94%) 4(5.06%) 1(1.26%)  
7-12(9.4) 61 9.45(6.04-12.86) 0.03b 57(93.44%) 4(6.56%) 0(0)  
13-19(17.4) 175 18.44(11.08-25.81)   155(88.57%) 20(11.43%) 6(3.43%)  
20-30(23.8) 256 15.70(9.89-21.5)   237(92.58%) 19(7.42%) 6(2.34%)  
31-40(35.7) 204 13.60(9.85-17.34)   188(92.16%) 16(7.84%) 3(1.47%)  
41-50(46.0) 173 15.42(9.34-21.51)   153(88.44%) 20(11.56%) 3(1.73%)  
> 51(64.5) 206 14.02(10.94-17.10)   184(89.32%) 22(10.68%) 3(1.46%)  
  1. a Based on two sample t-test and one-Way ANOVA.
  2. b Two sample t-test between 1–2 years and 13–19 years group.
  3. c Based on nonparametric tests for 2 independent sample and Kruskal-wallis H.