Table 2.

Comparison of mean slot width on the distal base of ceramic brackets of different brands

	n	Mean±SD	95% CI for mean		P	Post hoc
			Lower bound	Upper bound
1. Standard	20	0.558800	0.558800	0.558800	<0.001 (Significant)	1<2
2.American orthodontics	20	0.561500±0.0019601	0.560583	0.562417		2>1, 3, 4
3.Ormco	20	0.559350±0.0023458	0.558252	0.560448		3<2
4. 3M Unitek	20	0.559650±0.0021095	0.558663	0.560637		4<2

SD: Standard deviation, CI: Confidence interval