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Table 2 Univariate analysis of clinical manifestations between severe group and non-severe pertussis group

From: Risk factors and prediction model of severe pertussis in infants < 12 months of age in Tianjin, China

Characteristics

Severe pertussis group (n = 63)

Non-severe pertussis (n = 189)

t/χ2

P

Duration of disease (days)

12.0 (7.0, 14.5)

13.0 (10.0, 15.0)

− 0.857

0.391

Fever

    

 No

13 (20.6)

90 (47.6)

14.236

 < 0.001

 Yes

50 (79.4)

99 (52.4)

  

Cyanosis [(n) %)]

    

 No

19 (30.2)

121 (64.0)

21.943

 < 0.001

 Yes

44 (69.8)

68 (36.0)

  

Decreased heart rate [(n) %)]

    

 No

53 (84.1)

187 (98.9)

19.717

 < 0.001

 Yes

10 (15.9)

2 (1.1)

  

Pulmonary rales [(n) %)]

    

 No

9 (14.3)

94 (49.7)

25.235

 < 0.001

 Yes

54 (85.7)

95 (50.3)

  

Breathing heavily [(n) %)]

    

 No

45 (71.4)

188 (99.5)

53.299

 < 0.001

 Yes

18 (28.6)

1 (0.5)