. 2016 Nov 15;28:62. doi: 10.1186/s40557-016-0151-y

Table 3.

Comparison of Morbidity categories with age of the welders, duration of employment and daily welding hours (n = 300)

Morbidity categories		Number (%)	Age of the welders (years)		Duration of employment (years)		Welding Hours daily (Hours)
Morbidity categories		Number (%)	Mean ± SD	p-value*	Mean ± SD	p-value**	Mean ± SD	p-value*
Arc eye related symptoms	Yes	184 (61.3 %)	33.77 ± 5.93	<0.001	8.84 ± 5.59	<0.001	4.45 ± 0.91	<0.001
Arc eye related symptoms	No	116 (38.7 %)	27.35 ± 5.55	<0.001	3.92 ± 2.89	<0.001	3.76 ± 0.87	<0.001
Metal fume fever related symptoms	Yes	130 (43.3 %)	32.59 ± 6.41	0.003	8.21 ± 5.80	<0.001	4.42 ± 1.01	<0.05
Metal fume fever related symptoms	No	170 (56.7 %)	30.29 ± 6.53	0.003	5.96 ± 4.67	<0.001	4.01 ± 0.88	<0.05
Asthma related symptoms	Yes	140 (46.7 %)	32.66 ± 6.85	0.001	8.11 ± 5.82	<0.001	4.38 ± 0.96	<0.05
Asthma related symptoms	No	160 (53.3 %)	30.09 ± 6.09	0.001	5.91 ± 4.56	<0.001	4.01 ± 0.92	<0.05
Skin problems related symptoms	Yes	223 (74.3 %)	32.28 ± 6.63	0.000	7.88 ± 5.58	<0.001	4.31 ± 0.94	<0.001
Skin problems related symptoms	No	77 (25.7 %)	28.43 ± 5.53	0.000	4.19 ± 3.03	<0.001	3.81 ± 0.88	<0.001
Hearing problems related symptoms	Yes	107 (35.7 %)	36.55 ± 5.70	0.000	10.62 ± 6.28	<0.001	4.73 ± 0.85	<0.001
Hearing problems related symptoms	No	193 (74.3 %)	28.37 ± 5.03	0.000	4.90 ± 3.20	<0.001	3.88 ± 0.87	<0.001
Musculoskeletal problems related symptoms	Yes	140 (46.7 %)	30.96 ± 5.18	0.412	6.24 ± 3.45	0.882	4.21 ± 0.95	0.688
Musculoskeletal problems related symptoms	No	160 (53.3 %)	31.58 ± 7.59	0.412	7.55 ± 6.44	0.882	4.16 ± 0.96	0.688
Injuries	Yes	272 (90.7 %)	31.30 ± 6.60	0.949	7.04 ± 5.42	0.619	4.18 ± 0.96	0.847
Injuries	No	28 (9.3 %)	31.21 ± 6.37	0.949	5.42 ± 3.89	0.619	4.21 ± 0.87	0.847

* = t test, ** = Mann Whitney U test, Bold indicates p-value < 0.05, taken as significant