Table 2 Three comparisons of pulmonary function in children with different delayed asthma diagnosis time

First comparison

 ≤ 3 months

102.6 ± 13.2

99.5 ± 14.9

99.6 ± 7.7

91.6 ± 16.2

76.0 ± 20.9

88.0 ± 19.6

3–12 months

101.6 ± 14.4

98.1 ± 16.9

96.1 ± 7.9

90.1 ± 18.1

74.8 ± 23.1

86.2 ± 21.8

1–3 years

101.6 ± 13.7

98.5 ± 16.7

96.2 ± 8.9

90.8 ± 17.5

75.7 ± 24.2

87.1 ± 22.1

3–5 years

100.3 ± 14.8

96.6 ± 16.8

95.6 ± 9.5

89.5 ± 17.9

73.5 ± 23.8

84.8 ± 23.1

 > 5 years

98.5 ± 13.8

94.8 ± 14.8

95.7 ± 8.1

89.2 ± 14.9

73.9 ± 21.5

83.6 ± 19.5

F

4.9

5.0

1.1

1.4

0.8

2.6

P-value

0.03

0.03

0.3

0.2

0.4

0.1

Second comparison

 ≤ 3 months

104.3 ± 12.0

102.4 ± 2.8

97.9 ± 6.4

95.7 ± 15.1

82.4 ± 20.1

93.4 ± 17.9

3–12 months

103.1 ± 12.5

101.4 ± 14.0

98.2 ± 6.9

95.0 ± 15.7

82.5 ± 21.5

92.9 ± 20.4

1–3 years

103.0 ± 12.4

100.9 ± 14.8

97.5 ± 8.5

95.6 ± 16.4

80.9 ± 23.6

91.6 ± 21.3

3–5 years

102.2 ± 10.8

100.2 ± 12.3

97.7 ± 7.4

94.6 ± 14.3

80.1 ± 19.7

92.3 ± 18.6

 > 5 years

98.0 ± 13.6

96.0 ± 15.5

96.9 ± 7.5

93.2 ± 4.4

79.1 ± 21.8

88.2 ± 21.3

F

11.0

9.7

1.2

0.97

2.3

3.0

P-value

0.001

0.002

0.28

0.33

0.1

0.08

Third comparison

 ≤ 3 months

103.0 ± 11.7

101.5 ± 12.7

98.4 ± 6.9

97.0 ± 15.2

83.2 ± 20.7

93.9 ± 19.2

3–12 months

103.6 ± 12.1

101.5 ± 12.8

97.9 ± 6.4

96.8 ± 14.2

82.6 ± 20.5

93.7 ± 18.4

1–3 years

102.1 ± 12.2

101.2 ± 13.3

98.5 ± 7.7

96.4 ± 15.9

83.6 ± 22.1

94.1 ± 20.7

3–5 years

102.6 ± 13.0

101.2 ± 14.1

98.2 ± 7.1

97.7 ± 5.6

82.5 ± 18.9

95.7 ± 20.1

 > 5 years

99.0 ± 10.6

97.0 ± 10.8

97.5 ± 6.4

95.2 ± 12.6

80.4 ± 18.4

89.9 ± 19.3

F

4.5

3.0

0.5

0.4

0.9

1.0

P-value

0.03

0.08

0.5

0.5

0.3

0.3