Variables	Yes (N=140)		No (N=248)		OR	95% CI		P-value*
	n	%	n	%		Lower	Upper
Local exhaust provided and working:
Yes	57	44.5%	71	55.5%	1.71	1.11	2.65	0.015
No	83	31.9%	177	68.1%	1.00
Type of factory:
Cereal store	38	43.7%	49	56.3%	2.95	1.01	8.61	0.048
Flour packing	19	23.5%	62	76.5%	1.17	0.38	3.54	0.788
Bakery	21	30.9%	47	69.1%	1.70	0.56	5.16	0.351
Furniture Manufacture	57	44.5%	71	55.5%	3.05	1.07	8.67	0.036
Stone cutting	5	20.8%	19	79.2%	1.00