A randomised, assessor blind, parallel group comparative efficacy trial of three products for the treatment of head lice in children - melaleuca oil and lavender oil, pyrethrins and piperonyl butoxide, and a

Table 2 Louse-free Rate the Day After Final Treatment (PP population)

				P-value
		Number Louse-free	Louse-free Percentage	Unadjusted	Adjusted*
Louse-free rate: Tea Tree/Lavender Oil product versus Pyrethrins/piperonyl butoxide product	Tea Tree/Lavender Oil product	40 out of 41	97.56	< 0.0001	*
	Pyrethrins/piperonyl butoxide product	10 out of 30	33.33
Louse-free rate: Suffocation product versus Pyrethrins/piperonyl butoxide product	Suffocation product	37 out of 37	100	< 0.0001	*
	Pyrethrins/piperonyl butoxide product	10 out of 30	33.33

*The adjusted p-values could not be calculated because the generalized Hessian matrix was not positive definitive (the off-diagonal elements are too few)

ISSN: 1471-5945