TABLE 2.

Total cell counts (TCC) and differential sputum cell counts for patients with eosinophilic bronchitis (EB) and neutrophilic bronchitis (NB) living within each buffer zone for major roads, highways and industry

Buffer zone	Stable					Exacerbated
	Eosinophils, %	Neutrophils, %	TCC, ×106/g	Bronchitis, n		Eosinophils, %	Neutrophils, %	TCC, ×106/g	Bronchitis, n
				EB	NB				EB	NB
Total	2.5±8.1	61.2±27.1	9.4±12.1	121	124	4.1±11.3	66.6±27.9	19.3±26.4	64	75
Major road, m
0–100	2.7±4.8	74.4±24.7	13.7±10.9	24	18	1.4±2.3	74.1±25.0	23.4±21.8	5	12
>100–200	5.6±13.5	63.8±28.0	12.5±12.0	18	18	8.7±15.9	70.2±27.5	30.3±46.8	13	10
>200–300	7.0±13.6	63.6±24.8	14.3±15.4	28	17	8.8±15.4	63.2±26.6	9.1±8.5	15	6
>300–400	6.9±15.9	70.4±28.0	11.4±9.5	15	18	7.3±19.6	74.5±24.7	30.0±29.5	8	12
Other	4.0±8.4	66.4±24.8	19.4±17.7	36	53	4.4±10.0	71.9±27.3	28.2±26.6	23	35
Highway, m
0–500	5.7±15.1	71.1±24.7	18.5±20.4	16	17	6.6±12.2	71.6±25.3	26.1±25.8	6	8
>500–1000	6.2±11.9	62.4±28.3	10.4±9.3	19	14	8.7±16.7	72.5±25.7	24.8±29.5	4	10
>1000–1500	1.6±3.1	73.4±18.5	14.0±6.8	15	18	5.4±11.7	70.0±28.3	33.4±51.8	10	9
Other	4.5±9.7	68.1±27.2	15.2±13.9	71	75	4.9±13.5	71.2±26.5	22.3±21.6	44	48
Industry, km
0–1	6.3±10.2	66.1±23.3	13.2±9.2	13	15	9.0±18.4	68.4±27.8	30.1±52.0	11	10
>1–2	4.1±10.3	69.9±29.2	16.0±13.8	18	21	6.5±17.7	67.1±29.2	17.1±16.6	8	11
>2–3	3.2±6.7	67.3±25.5	11.6±9.5	16	14	5.5±12.8	61.4±28.9	18.2±17.3	11	8
>3–4	7.3±12.8	67.4±28.1	10.6±7.4	17	8	1.8±2.6	84.1±14.2	35.5±32.6	5	10
Other	4.6±11.9	68.5±25.6	17.2±17.8	57	66	4.9±10.5	72.7±26.1	24.8±22.1	29	36

Data presented as mean ± SD unless otherwise indicated