Heterogeneous pattern of differences in respiratory parameters between elderly with either good or poor FEV1

BMC Pulmonary Medicine

Table 4 Parameters of the diffusing capacity for CO and NO

Parameter	UED group			LED group			Mean difference (UED-LED)	95% CI of difference		p-value for difference
Parameter	Number	Mean ± SD	Median (25%; 75%)	Number	Mean ± SD	Median (25%; 75%)	Mean difference (UED-LED)	Lower	Upper	p-value for difference
TLCO %pred	70	92.1 ± 16.7	89.8 (81.3; 102.2)	51	82.2 ± 14.2	83.2 (68.4; 92.9)	9.8	4.3	15.4	0.001
KCO %pred	70	98.6 ± 16.7	98.7 (89.0; 110.3)	51	101.8 ± 17.7	100.1 (89.3; 112.1)	−3.2	−9.5	3.1	0.316
TLNO %pred	70	95.0 ± 17.4	94.1 (83.8; 106.2)	51	80.0 ± 14.8	79.6 (70.1; 92.1)	15.0	9.2	20.8	< 0.001
KNO %pred	70	102.7 ± 17.8	102.5 (93.3; 113.9)	51	100.0 ± 16.5	101.1 (87.4; 108.5)	2.7	−3.6	8.9	0.400
TLNO/TLCO	70	4.74 ± 0.34	4.67 (4.54; 4.92)	51	4.53 ± 0.29	4.52 (4.36; 4.65)	0.21	0.10	0.33	< 0.001
TLC_He/TLC_pleth	70	0.834 ± 0.052	0.832 (0.798; 0.867)	51	0.806 ± 0.071	0.810 (0.755; 0.851)	0.028	0.005	0.052	0.018
Hb, mg/dl	53	13.9 ± 1.1	13.9 (13.2; 14.8)	48	13.7 ± 1.3	13.7 (12.8; 14.5)	0.2	−0.3	0.7	0.469

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