Investigation of the Prevalence and Diagnosis of Chronic Obstructive Pulmonary Disease in a Group of Elderly Individuals Residing in an Island Area of Ningbo

Table 1

Comparison of prevalence among individuals with different factors.

	Number of cases	Prevalence rate (n (%))	χ^2 value	value
Gender			96.478	<0.01
Men	682	197 (28.9)
Women	689	57 (8.3)
Age			55.189	<0.01
60–69 years	786	99 (12.6)
70–79 years	475	113 (23.8)
≥80 years	110	42 (38.2)
Smoking			133.722	<0.01
Yes	572	188 (32.9)
No	799	66 (8.3)
Smoking (pack-years)			150.310	<0.01
0	799	66 (8.3)
1–14.9	66	12 (18.2)
15–29.9	106	31 (29.1)
≥30	400	145 (36.1)
BMI			2.654	>0.01
<18.5	56	14 (25.0)
18.5–23.9	692	133 (19.2)
24.0–27.9	480	81 (16.9)
≥28	143	26 (18.2)
Family history of respiratory diseases			2.659	>0.01
Yes	135	32 (23.7)
No	1236	222 (18.0)
Exposure to biomass smoke from cooking			Unable to judge	Unable to judge
Yes	997	155 (15.6)
No	374	99 (26.5)
Cough			129.282	<0.01
Yes	458	162 (35.4)
No	913	92 (10.1)
Dyspnea			114.045	>0.01
Level 1	1024	128 (12.5)
Level 2	280	90 (32.1)
Levels 3–5	67	36 (53.7)