[Table/Fig-7]:

Association between age, duration of work experience, hours of work and continuous work in a day and overcrowding at welding sites with number of morbidities among welders over the past one month.

Parameters	Number of welders	Mean no. of morbidities in the past month	95% Confidence interval for mean
Age group
18 – 25	16	3.6±3.3	1.8860 – 5.3640
26 – 35	13	2.8±1.4	1.9453 – 3.5932
≥36	9	4.4±3.4	1.8631 – 7.0258
Total	38		F†=0.977, p=0.387
Years of work experience
≤5	17	3.5±2.7	2.0729 – 4.8683
6-10	8	3.25±2.91	0.8126 – 5.6874
11-15	3	2.67±1.53	1.1279 – 6.4612
16-20	6	2.67±1.5	1.0867 – 4.2466
>20	4	6.25±4.35	0.6708 – 13.1708
Total	38		F=1.218, p=0.322
Hours of work per day
≤8 hours	24	3.04±1.94	2.2206 – 3.8627
>8 hours	14	4.36±3.77	2.1778 – 6.5365
Total	38		t**=1.423, p=0.163
Hours of continuous work per day
<4 hours	18	2.9±2.1	1.8865 – 4.0024
5 hours	8	3.75±2.7	1.4824 – 6.0176
≥6 hours	2	7.5±3.5	24.2655 – 39.2655
Total	28		F=3.375, p=0.05
Overcrowding
Present	3	7.3±4.6	4.104 – 18.8071
Absent	29	2.9±1.8	2.1672 – 3.5570
Total	32		t=3.461, p=0.002
No. of persons working together
2 – 3	7	2.2±0.8	1.611 – 3.2389
4 – 5	11	2.1±0.9	1.3978 – 2.8244
6 – 10	13	3.45±2.5	1.7720 – 5.1371
>10	7	5.7±3.6	1.8732 – 9.4602
Total	38		F=3.439, p=0.031

^†One-way ANOVA

^**Unpaired t test