The Influence of Age on Interaction between Breath-Holding Test and Single-Breath Carbon Dioxide Test

Table 1

Characteristics of the subjects.

	⁢Age group
	25–44 years	45–59 years	60–74 years	≥75 years
Average age, years	34 ± 5	53 ± 4	66 ± 4	79 ± 3
Weight, kg	72 ± 4	76 ± 4	74 ± 4	69 ± 4
Height, cm	167 ± 4	164 ± 5	165 ± 6	164 ± 4
FEV1 (% predicted)	98 ± 4	96 ± 6	97 ± 7	95 ± 5
VLC (% predicted)	101 ± 3	99 ± 4	95 ± 6	94 ± 6

FEV₁: forced expiratory volume; VLC: vital lung capacity. Data are presented as mean ± standard deviation.