Table 2.

Pneumonia prevalence among children with different situations of residential traffic.

Indictors for Residential Traffic	Sample Size, n (%)	Prevalence, n (%)	p-Value a
Main traffic road near residence within 200 m
Yes	2225 (40.6)	630 (29.0)
No	3259 (59.4)	762 (23.9)	<0.001
Linear distance between residence and the main traffic road
≤50 m	669 (13.5)	186 (28.6)
51–100 m	475 (9.6)	139 (29.6)
101–200 m	555 (11.2)	149 (27.2)
>200 m	3259 (65.7)	762 (23.9)	0.005
Lane counts of the main traffic road near residence within 200 m
≤2 lanes	499 (31.3)	123 (25.5)
3–5 lanes	662 (41.5)	197 (30.2)
≥6 lanes	434 (27.2)	134 (31.4)	0.109
Heavy truck passed through the main traffic road near residence within 200 m
Yes	827 (50.0)	222 (27.3)
No	828 (50.0)	235 (29.0)	0.445
Bedroom faced to the main traffic road near residence within 200 m
Yes	802 (47.7)	221 (28.3)
No	879 (52.3)	249 (28.7)	0.874
Filling station near residence within 200 m
Yes	234 (4.1)	71 (30.7)
No	5189 (95.7)	1302 (25.6)	0.081
Linear distance between residence and the filling station
≤100 m	105 (1.9)	41 (39.0)
101–200 m	129 (2.4)	30 (23.8)
>200 m	5189 (95.7)	1302 (25.6)	0.007
Automobile 4S shop near residence within 200 m
Yes	117 (2.1)	41 (35.3)
No	5327 (97.9)	1338 (25.6)	0.018
Linear distance between residence and the automobile 4S shop
≤100 m	72 (1.3)	26 (36.6)
101–200 m	45 (0.8)	15 (33.3)
>200 m	5327 (97.9)	1338 (25.6)	0.056
Ground car park in the residential community
Yes	3234 (59.8)	909 (28.6)
No	2175 (40.2)	467 (21.9)	<0.001
Average number of cars parked in the ground car park per day
≤20	1014 (36.2)	251 (25.2)
21–50	795 (28.4)	233 (29.7)
51–100	532 (19.0)	159 (30.2)
>100	459 (16.4)	151 (34.0)	0.004

^a In the Pearson’s chi-square test; Bold indicates significance (p-value < 0.05).