Table 1 Patient demographic characteristics, urban air quality and disease conditions
Total, n (%) | Missing, n (%) | |
|---|---|---|
All patients | 312 (100) | |
Sex | 1 (0.3) | |
Male | 101 (32.4) | |
Female | 210 (67.3) | |
Age | 0 | |
< 24 years | 102 (32.7) | |
≥ 24 years | 210 (67.3) | |
Duration | 24 (7.7) | |
< 3 years | 209 (67.0) | |
≥ 3 years | 79 (25.3) | |
BMIa | 10 (3.2) | |
< 25 | 271 (86.0) | |
≥ 25 | 31 (9.8) | |
Relationship status | 9 (2.9) | |
Married | 153 (49.0) | |
Single | 150 (48.1) | |
Highest level of education | 4 (1.3) | |
High school education or less | 103 (3.3) | |
College or above | 205 (65.7) | |
Employment | 6 (1.9) | |
Employed | 175 (56.1) | |
Unemployed/student | 131 (42.0) | |
Diet preference | 136 (43.6) | |
No | 59 (18.9) | |
Yes | 117 (37.5) | |
Smoking | 5 (1.6) | |
No | 197 (63.1) | |
Yes | 110 (35.3) | |
Alcohol consumption | 4 (1.3) | |
No | 174 (55.8) | |
Yes | 134 (42.9) | |
Exercise | 7 (2.2) | |
No | 134 (42.9) | |
Yes | 171 (54.8) | |
Hospitalized for skin disease over the previous year | 7 (2.2) | |
No | 224 (71.8) | |
Yes | 81 (26.0) | |
Income | ||
≤ 4000 yuan per month | 200 (64.1) | |
> 4000 yuan per month | 112 (35.9) | |
Medical insurance | 24 (7.7) | |
No | 80 (25.6) | |
Yes | 213 (68.3) | |
SO2 level in the air | ||
< 20 μg/m3 | 133 (42.6) | |
20–40 μg/m3 | 85 (27.2) | |
> 40 μg/m3 | 94 (30.1) | |
NO2 level in the air | ||
≤50 μg/m3 | 123 (39.4) | |
> 50 μg/m3 | 189 (60.6) | |
CO level in the air | ||
< 2 μg/m3 | 199 (63.8) | |
2–4 μg/m3 | 93 (29.8) | |
> 4 μg/m3 | 20 (6.4) | |
O3 level in the air | ||
< 100 μg/m3 | 38 (12.2) | |
100–160 μg/m3 | 131 (42.0) | |
> 160 μg/m3 | 143 (45.8) | |
PM 2.5 level in the air | ||
< 60 μg/m3 | 128 (41.0) | |
60–80 μg/m3 | 159 (51.0) | |
> 80 μg/m3 | 25 (8.0) | |
PM 10 level in the air | ||
< 70 μg/m3 | 112 (35.9) | |
70–120 μg/m3 | 141 (45.2) | |
> 120 μg/m3 | 59 (18.9) | |
Disease severity | 9 (2.9) | |
Mild | 144 (46.2) | |
Moderate | 138 (44.2) | |
Severe | 21 (6.7) | |