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Table 1 Analysis of data normality (Shapiro-Wilk test)

From: Effect of air-polishing on surface roughness of composite dental restorative material – comparison of three different air-polishing powders

Variable

Before air-polishing

After air-polishing

Group SB

Group G

Group E

Sa

< 0,001*

0,885

0,085

0,116

Sq

< 0,001*

0,266

0,358

0,017*

Sku

< 0,001*

< 0,001*

0,001*

< 0,001*

Sp

< 0,001*

0,02*

0,165

< 0,001*

Sv

< 0,001*

0,041*

0,223

0,001*

Sz

< 0,001*

0,247

0,191

< 0,001*

Ssk

0,021*

0,487

0,181

0,003*

  1. * p < 0.05 is evidence of non-normal distribution
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BMC Oral Health

ISSN: 1472-6831

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