Table 2. Results of symptom screening, chest X-ray, sputum smear, and sputum culture examination.

Results of Screening	Culture postive		Culture negative
	Smear positive(%)	Smear negative(%)	Smear positive(%)	Smear negative(%)
Chest Symptoms positive
Chest X-ray positive (n = 306)	25(8.0)	15(5.0)	6(2.0)	260(85.0)
Chest X-ray negative (n = 3331)	9(0.3)	18(0.5)	26(0.8)	3278(98.4)
Chest Symptoms negative
Chest X-ray positive (n = 914)	29(3.2)	23(2.5)	10(1.1)	852(93.2)
Chest X-ray negative (n = 45747)	29(3.2)	1(0.002)	1(0.002)	45745(99.996)