Table 3.

Seroprevalence of tetanus immunity by socioeconomic class

Socioeconomic class	Level of tetanus immunity				Total	P	OR (95% CI)
	Non-protective		Protective
	n	%	N	%
High*	123	64.7	67	35.3	190	-	1
Middle	206	60.9	132	39.1	338	0.441	0.85 (0.59, 1.23)
Low	198	61.3	125	38.7	323	0.495	0.86 (0.59, 1.25)

Chi Square test for trend = 0.47; p = 0.495.

*Reference category, OR = Odds Ratio (for being seronegative), CI = Confidence Interval.