The prevalence and risk indicators of tooth wear in 12- and 15-year-old adolescents in Central China

BMC Oral Health

Table 4 The percentages of respondents with tooth wear (BEWE2-3) according to demographics and oral hygiene factors

	N	Tooth wear		P
	N	BEWE2-3	%	P
Age				<0.001
12 years	360	67	18.6
15 years	360	322	89.4
Gender				0.331
Boy	360	201	55.8
Girl	360	188	52.2
Social-economic class				0.045
Low (scores 1–5)	283	166	58.7
High (scores 6–10)	437	223	51.0
Frequency of brushing				0.004
Twice or more daily	543	277	51.0
Once or less daily	177	112	63.3
Duration of brushing				0.038
> 2 min	218	105	48.2
≤ 2 min	502	284	56.6
Toothbrush bristle				0.064
Soft bristles	381	196	51.4
Medium	223	130	58.3
Hard bristles	35	24	68.6
Toothbrushing method				0.714
Mixed brushing	459	245	53.4
Horizontal brushing	103	54	52.4
Vertical brushing	135	77	57.0
Fluoride toothpaste				0.077
Yes	231	117	50.6
No	63	24	38.1
Accumulated use time				0.987
> 1 year	142	72	50.7
< 1 year	89	45	50.6
Toothbrush				0.778
Manual toothbrush	621	336	54.1
Electric toothbrush	27	16	59.3
Both	72	37	51.4
Frequency of changing toothbrush				0.967
> 3 months	354	191	54.0
< 3 months	366	198	54.1

ISSN: 1472-6831