Table 4.

Relation between years of working experience and dental attrition among stone mine workers

Age groups (y)		<1 y	1–3 y	3–5 y	>5 y	Chi-square test	p*
17–26	No attrition	20	13	0	0	43.649	0.000
	1–3 teeth affected	13	35	59	0
	4–7 teeth affected	0	0	0	0
	7–10 teeth affected	0	0	0	0
	>10 teeth affected	0	0	0	0
27–36	No attrition	11	0	0	0	211.219	0.000
	1–3 teeth affected	0	0	49	3
	4–7 teeth affected	0	20	69	12
	7–10 teeth affected	0	0	23	0
	>10 teeth affected	0	0	0	0
37–46	No attrition	7	5	2	0	111.381	0.000
	1–3 teeth affected	0	0	2	0
	4–7 teeth affected	0	0	0	0
	7–10 teeth affected	0	0	39	34
	>10 teeth affected	0	0	8	23
47–56	No attrition	3	0	6	0	51.211	0.000
	1–3 teeth affected	0	0	0	39
	4–7 teeth affected	0	0	7	8
	7–10 teeth affected	0	0	0	0
	>10 teeth affected

* A p value of <0.05 is significant.