Table 3

Lung function variables in birthweight groups

	Birthweight group			All <1501 g v >2499 g birth weight			500–999 g v 1000–1500 g birth weight
	500–999 g	1000–1500 g	>2499 g		δ^3-150		95% CI^3-151			δ^3-152		95% CI^3-151
Lung function variable	(n = 72)	(n = 97)	(n = 39)		δ^3-150		95% CI^3-151			δ^3-152		95% CI^3-151
FVC	100.6 (13.3)	100.6 (12.1)	104.8 (12.0)		−4.2	−8.5 to 0.2		0.0	−3.8 to 3.8
FEV₁	93.1 (14.9)	96.1 (14.0)	104.6 (13.2)		−10.1	−15.0 to −5.1		−3.0	−7.3 to 1.3
FEV₁/FVC (%)	81.9 (10.6)	83.8 (8.9)	87.0 (7.0)		−4.1	−7.4 to −0.9		−1.9	−4.8 to 0.9
V′_EMAX75%	93.1 (24.0)	94.7 (21.6)	110.7 (22.1)		−16.8	−24.7 to −8.9		−1.5	−8.6 to 5.5
V′_EMAX50%	89.9 (30.5)	95.2 (27.1)	113.0 (25.7)		−20.5	−30.3 to −10.7		−5.4	−14.1 to 3.4
V′_EMAX25%	87.5 (37.1)	93.0 (35.5)	110.7 (35.1)		−20.4	−33.0 to −7.8		−5.5	−16.6 to 5.6
FEF_25–75%	77.0 (26.8)	83.3 (25.3)	99.1 (23.4)		−19.0	−27.9 to −10.1		−6.3	−14.7 to 1.5
RV	112.1 (43.3)	114.5 (40.2)	117.4 (30.8)		−4.1	−18.1 to 10.0		−2.4	−14.7 to 10.0
TLC	98.9 (16.0)	99.4 (13.1)	102.5 (13.9)		−3.3	−8.3 to 1.7		−0.5	−4.9 to 3.9
RV/TLC (%)	27.5 (9.2)	27.5 (7.5)	26.8 (6.3)		0.7	−2.1 to 3.5		0.1	−2.4 to 2.5

Data expressed as mean (SD), and are % predicted for height, age, and gender, unless otherwise specified.
↵3-150 Difference between all <1501 g and controls.
↵3-151 95% confidence interval for difference between groups.
↵3-152 Difference between 500–999 g and 1000–1500 g groups.