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Table 4 The distribution of anti-Dtx, anti-Ttx and anti-Ptx IgG in neonates hospitalized in the neonatal ward

From: The maternal antibody against diphtheria, tetanus and pertussis showed distinct regional difference in China

Antibody levelN, Prevalence (95% CI)χ2, P
ShunyiQianjiang
Anti-Dtx IgG
  < 0.01 IU/ml52.5% (1.1–5.7%)10242.9% (36.7–49.2%)χ2 = 95.876, P < 0.0001
 0.01- < 0.1 IU/ml13467.0% (60.2–73.1%)11950.0% (43.7–56.3%)χ2 = 12.873, P = 0.0003
 0.1–1.0 IU/ml6030.0% (24.1–36.7%)166.72% (4.2–10.6%)χ2 = 41.016, P < 0.0001
  > 1.0–1.5 IU/ml00 (0–1.9%)00 (0–1.6%)
  > 1.5–2.0 IU/ml00 (0–1.9%)10.4% (0.1–2.3%)χ2 = 0.842, P = 0.3588
  > 2.0 IU/ml10.5% (0.1–2.8%)00 (0–1.6%)χ2 = 1.193, P = 0.2748
Anti-Ttx IgG
  < 0.01 IU/ml5829.0% (23.2–35.6%)10544.2% (38.0–50.5%)χ2 = 10.63, P = 0.0011
 0.01–0.1 IU/ml8542.5% (35.9–49.4%)11548.3% (42.1–54.6%)χ2 = 1.483, P = 0.2233
  > 0.1–0.5 IU/ml3618.0% (13.3–23.9%)177.1% (4.5–11.1%)χ2 = 12.044, P = 0.0005
  > 0.5–1.0 IU/ml168.0% (5.0–12.6%)10.4% (0.1–2.3%)χ2 = 16.737, P < 0.0001
  > 1.0–5.0 IU/ml42.0% (0.8–5.0%)00 (0–1.6%)χ2 = 4.804, P = 0.0284
  > 5.0 IU/ml10.5% (0.1–2.8%)00 (0–1.6%)χ2 = 1.193, P = 0.2748
Anti-Ptx IgG
  < 5.0 IU/ml13969.5% (62.8–75.5%)14360.1% (53.8–66.1%)χ2 = 4.202, P = 0.0404
 5.0- < 40.0 IU/ml5929.5% (23.6–36.2%)9037.8% (31.9–44.1%)χ2 = 3.348, P = 0.0673
 40.0- < 100.0 IU/ml21.0% (0.3–3.6%)31.3% (0.4–3.6%)χ2 = 0.065, P = 0.7982
  ≥ 100.0 IU/ml00 (0–1.9%)20.8% (0.2–3.0%)χ2 = 1.688, P = 0.1932