Table 1.

Immunity to diphtheria and pertussis in subjects by different groups

		Anti-diphtheria antibodies		Anti-PT antibodies
Characteristics	Total	Positive rate (95% CI) (%)	Concentration and 95% CI(IU/ml)	Positive rate (95% CI)(%)	Concentration and 95% CI(IU/ml)
Gender
Male	1058	67.96[65.09–70.70]	2.871[2.527–3.215]	14.27[12.29–16.51]	16.611[15.009–18.213]
Female	1089	64.65[61.76–67.43]	2.374[2.065–2.682]	10.47[8.78–12.43]	13.755[12.477–15.033]
P		0.105	0.034	0.007	0.006
Registered population
Native	1082	70.89[68.11–73.52]	2.92[2.577–3.262]	12.20[10.38–14.29]	15.05[13.550–16.551]
Migrant	1065	61.60[58.64–64.47]	2.313[2.005–2.621]	12.49[10.63–14.61]	15.277[13.887–16.666]
P		<0.001	0.01	0.839	0.828
Age groups
0	206	87.38[82.07–91.60]	3.757[2.984–4.530]	22.33[16.88–28.65]	23.101[19.150–27.051]
1–4	211	97.63[94.54–99.22]	5.643[4.623–6.663]	13.74[9.41–19.13]	16.32[12.744–19.895]
5–9	226	92.48[88.24–95.58]	6.262[5.252–7.273]	5.75[3.09–9.65]	10.532[8.011–13.054]
10–14	216	83.80[78.20–88.43]	2.981[2.276–3.686]	12.50[8.42–17.63]	13.295[10.915–15.675]
15–19	220	73.64[67.33–79.37]	3.582[2.745–4.420]	10.91[7.12–15.80]	14.282[11.388–17.178]
20–24	222	59.01[52.23–65.55]	1.701[1.101–2.301]	13.51[9.33–18.72]	14.787[11.797–17.777]
25–29	204	52.45[45.40–59.50]	1.037[0.622–1.453]	10.78[6.90–15.84]	15.229[11.714–18.744]
30–34	222	43.69[37.08–50.45]	0.398[0.180–0.617]	12.16[8.17–17.18]	13.961[10.756–17.166]
35–39	206	37.38[30.79–44.37]	0.233[0.159–0.308]	10.19[6.45–15.17]	14.414[11.019–17.809]
≥40	214	34.11[27.81–40.92]	0.396[0.131–0.660]	12.15[8.10–17.28]	16.353[12.625–20.080]
P		<0.001	<0.001	<0.001	<0.001
Total	2147	66.28[64.25–68.25]	2.619[2.388–2.849]	12.34[11.02–13.80]	15.163[14.140–16.185]