Bulletin of the National Research Centre

Table 1 Minimum, maximum, mean and standard deviation of before and after in both groups and comparison between before and after (effect of time)

From: Effect of thermocycling on acetal resin versus PEEK surface hardness and flexure strength of implant-retained overdenture bars: in vitro study

	Minimum	Maximum	Mean	SD	P value
PEEK
Before	26.2	26.7	26.30	0.14	0.51
After	24.3	24.7	24.50	0.20
Acetal
Before	23	24.7	23.63	0.93	0.03*
After	20.8	21.2	21.03	0.21

M: mean, SD: standard deviation, MD: mean difference, SEM: standard error mean, CI: confidence interval, L: lower arm, U: upper arm
*Significant difference as P < 0.05

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