Table 2.

Respondent characteristic.

Variable characteristic respondent	Frequency	Percentage (%)
Gender
1.Male	30	100
2.Female	0	0
Age
1.< 40 years old	8	27
2.> 40 years old	22	73
Education level
1.Elementary school	10	34
2.Junior high school	14	46
3.Senior high school	4	13
4.No school	2	7
Length of work
1.1–5 years	0
2.6–10 years	5	17
3.11–15 years	6	20
4.16–20 years	7	23
5.> 20 years	12	40
Weight
1.150 – 155 kg	5	17
2.156 – 160 kg	14	47
3.> 160 kg	11	36
Smoking habit	25	83