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Table 3 Pulmonary function test results of children with PIBO at the time of diagnosis (mean ± SD)

From: Post-infectious bronchiolitis obliterans in children: a review of 42 cases

Pulmonary function tests

Test index

Estimated value (% Predicted)

Total cases, n = 42

G1, n = 21

G2, n = 10

G3, n = 11

P 1

P 2

P 3

Tidal breathing analysis

tPTEF%tE

(23.9 ± 4.6)%

(22.9 ± 4.8)%

(25.4 ± 6.2)%

(24.6 ± 6.5)%

0.23

0.41

0.78

VPEF%VE

(20.5 ± 3.9)%

(19.4 ± 4.1)%

(20.8 ± 4.7)%

(22.4 ± 5.1)%

0.40

0.08

0.47

Impulse oscillometry

 

Total cases, n = 42

G1, n = 8

G2, n = 4

G3, n = 4

P 1

P 2

P 3

Z5

(147.5 ± 39.3)%

(153.2 ± 44.2)%

(134.9 ± 51.7)%

(148.7 ± 36.0)%

0.54

0.86

0.68

R5

(140.4 ± 32.9)%

(137.2 ± 40.1)%

(129.5 ± 43.4)%

(157.7 ± 32.9)%

0.77

0.40

0.34

X5

(226.5 ± 63.6)%

(189.2 ± 40.4)%

(247.7 ± 59.3)%

(279.9 ± 63.6)%

0.07

0.01

0.49

  1. Note: tPTEF%tE: ratio of time to reach peak tidal expiratory flow to total expiratory time; VPEF%VE: ratio of volume to reach peak expiratory flow to total expiratory volume; Z5: magnitude of respiratory impedance; R5: total respiratory resistance; X5: distal capacitive reactance; FEV1: forced expiratory volume in 1 sec; PEF: peak expiratory flow. Independent sample t-tests were used to compare continuous variables, including tPTEF%tE, VPEF%VE, Z5, R5 and X5.
  2. P 1 = comparing G1 with G2; P 2 = comparing G1 with G3; P 3 = comparing G2 with G3.