Table 4.

Multiple multinomial regression models of factors associated with the presence of mid-buccal RT1 or mid-buccal RT2/RT3 gingival recessions in at least one tooth (adjusted for gender)

		OR	95% CI	P value
At least 1 RT1 recession (subjects without RT2 and RT3 recessions)
	Age groups (years)
	20–39	0.498	0.254–0.976	0.042
	40–59	0.752	0.405–1.394	0.365
	60–75	Ref	Ref	Ref
	Education level
	Low	0.510	0.280–0.929	0.028
	Middle	0.819	0.479–1.399	0.465
	High	Ref	Ref	Ref
	Periodontal status
	No periodontitis	1.022	0.490–2.133	0.954
	Moderate periodontitis	1.411	0.728–2.737	0.308
	Severe periodontitis	Ref	Ref	Ref
	FMPS (%)
	< 30	2.401	1.229–4.692	0.010
	30–60	2.108	0.924–3.631	0.087
	> 60	Ref	Ref	Ref
At least 1 RT2 or RT3 recession
	Age groups (years)
	20–39	0.184	0.102–0.334	<0.001
	40–59	0.536	0.340–0.845	0.007
	60–75	Ref	Ref	Ref
	Education level
	Low	1.866	1.087–3.204	0.024
	Middle	1.867	1.075–3.244	0.027
	High	Ref	Ref	Ref
	Periodontal status
	No periodontitis	0.023	0.010–0.054	<0.001
	Moderate periodontitis	0.273	0.179–0.415	<0.001
	Severe periodontitis	Ref	Ref	Ref
	FMPS (%)
	< 30	0.740	0.547–0.953	0.047
	30–60	1.238	0.812–1.886	0.322
	> 60	Ref	Ref	Ref

GR, gingival recession; OR, odds ratio; 95% IC, 95% confidence interval; ref, reference