BMC Oral Health

Table 1 Alternative correlation coefficients (Pearson r, Spearman ρ, intraclass ICC) for the self-reported and clinically assessed number of teeth among men

From: Validity of self-reported number of teeth in middle-aged Finnish adults: the Northern Finland Birth Cohort Study 1966

	n	%	r	ρ	ICC
Education (n = 730)
Basic	45	6	0.96	0.91	0.95
Secondary	322	44	0.80	0.74	0.79
Higher	363	50	0.74	0.79	0.72
Tooth brushing frequency (n = 738)
Once daily or less	359	49	0.81	0.78	0.80
At least twice daily	379	51	0.80	0.79	0.80
Smoking status (n = 680)
Never	299	44	0.75	0.79	0.74
Former	208	31	0.79	0.80	0.79
Current	173	25	0.87	0.77	0.86
Total	740	100	0.81	0.78	0.80

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ISSN: 1472-6831

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