Table 2.

Crossover effect of estimated fluoride means between two groups

Cross-over	Period (1) (mean±SD)					Wash out period	Period (2) (mean±SD)
	Base	T5’	T10’	T20’	T45’		Base	T5’	T10’	T20’	T45’
P-gum	0.041±0.013	0.103±0.142	0.056±0.026	0.05±0.017	0.049±0.014	10 days	0.036±0.014	0.06±0.023	0.055±0.015	0.043±0.021	0.035±0.017
S-gum	0.038±0.011	0.067±0.028	0.052±0.015	0.047±0.014	0.049±0.024		0.04±0.014	0.059±0.021	0.072±0.087	0.050±0.016	0.043±0.012
Period effect‡ (P)	0.082
Carryover effect‡ (P)	0.703
Main effect* (P)	0.244

^‡ANOVA-repeated measure test was used to check period and carryover effect, *Statistical difference within two P-gum and S-gum intervention groups using repeated measure test. SD: Standard deviation; P-gum: Persica chewing gums; S-gum: Sodium fluoride chewing gums