Table 2

Change in demographic characteristics and respiratory function of designated air pollution victims by comparison group between initial evaluation and follow-up

	Initial evaluation	Follow-up	p Value	Initial evaluation	Follow-up	p Value	Initial evaluation	Follow-up	p Value	Initial evaluation	Follow-up	p Value
	Group A			Group B			Group C			Group D
Age	54.3±8.3	78.6±6.5	<0.001	49.6±8.2	77.3±7.5	<0.001	49.8±7.8	74.2±7.1	<0.001	51.3±8.9	76.5±7.8	<0.001
Height (cm)	161.7±6.3	159.3±6.9	<0.001	155.2±7.6	150.8±8.8	<0.001	161.4±6.1	159.2±6.2	<0.001	152.8±7.5	148.9±8.8	<0.001
Weight (kg)	56.9±6.4	55.4±9.2	<0.001	55.4±9.3	52.1±10.9	<0.001	59.1±8.9	58.9±9.6	<0.001	55.2±9.7	53.2±11.3	<0.001
BMI	21.8±1.9	21.7±2.9	<0.001	22.8±3.6	22.7±3.9	<0.001	22.6±2.8	23.2±3.1	<0.05	23.4±3.8	23.9±4.2	0.13
PFT
FVC (L)	3.37±0.79	2.54±0.85	<0.001	3.04±0.79	2.21±0.73	<0.001	3.49±0.76	2.78±0.81	<0.001	2.94±0.68	2.28±0.69	<0.001
VC (%)	105.5±18.7	93.1±21.7	<0.001	103.5±18.5	90.3±22.3	<0.001	108.3±15.5	100.2±21.9	<0.001	107±17.3	100.4±23.4	<0.001
FEV₁ (L)	2.09±0.64	1.28±0.53	<0.001	1.72±0.58	1.29±0.51	<0.001	2.67±0.58	1.8±0.68	<0.001	2.24±0.58	1.61±0.52	<0.001
FEV₁/FVC (%)	64.9±6.5	54.5±2.3	<0.001	59.8±10.3	62.1±13.4	<0.001	79.1±5.6	67.9±10.2	<0.001	79.6±7.1	73.8±13.8	<0.001

Figures are presented as mean±SD.
Initial evaluation versus follow-up: Mann-Whitney U test.
PFT, pulmonary function testing; BMI, body mass index; FEV₁/FVC (%), forced expiratory volume in 1 s/forced vital capacity; VC, vital capacity.