Table 3.

Influence of gender, age and educational level in brushing habits and use of fluoride toothpaste at baseline (T0) and at 12 months of follow-up (T1)^*

Variable	T0						T1
	Brushing habit		Brushing day and night		Use of fluoride toothpaste		Brushing habit		Brushing day and night		Use of fluoride toothpaste
	n†	%‡	n	%	N	%	n†	%‡	n	%	n	%
All	6,635	7; 10; 24; 59	3,922	76.3	6,152	68.9	5,712	3; 5; 19; 74	4,207	81.7	5,563	79.7
Sex
1 (Man)	2,711	9; 11; 25; 55	1,485	72.3	2,458	69.0	2,238	4; 6; 22; 69	1,541	78.6	2,158	78.0
2 (Woman)	2,893	8; 10; 24; 58	1,674	72.1	2,670	67.8	2,379	3; 6; 20; 71	1,690	76.2	2,310	76.7
P-value§		0.011		0.955		0.353		0.105		0.108		0.308
Age (years)
0 to <6 years	1,108	35; 13; 32; 20	219	90.9	720	60.4	597	18; 4; 44; 34	206	95.6	490	73.5
6 to <15 years	3,594	2; 11; 23; 64	2,299	71.2	3,514	73.1	3,307	1; 6; 20; 73	2,400	74.6	3,265	81.0
≥ 15 years	895	1; 7; 20; 71	639	68.7	887	56.3	714	0; 4; 9; 87	625	81.8	714	63.2
P-value		<0.001		<0.001		<0.001		<0.001		<0.001		<0.001
Education level
1 (basic or primary school)	90	0; 2; 4; 93	84	65.5	90	67.8	94	0; 2; 4; 94	88	71.6	94	75.5
2 (secondary school)	217	0; 0; 5; 95	207	70.0	217	58.5	221	0; 0; 1; 99	218	83.9	221	74.7
3–4 (university or still studying)	349	0; 0; 7; 93	323	61.9	349	56.2	351	0; 0; 1; 99	347	80.1	351	73.2
¶P-value		0.404		0.159		0.137		0.003		0.049		0.871

^*Morocco, Egypt, Greece-HDA, Hellenic Dental Association; Greece-SSG, Stomatological Society of Greece; Indonesia, Myanmar, Vietnam, Germany and Italy.

^†Valid sample for each item of questionnaire.

^‡Never; Sometimes; 1/day; ≥2/day. Data are given as whole-number percentage values (i.e. no decimals).

^§P-values were calculated using the Mann–Whitney U-test (toothbrushing habit) and corrected chi-square test (brushing day/night and use of fluoride toothpaste).

^¶P-values were calculated using the Kruskal–Wallis test (toothbrushing habit) and the chi-square test (brushing day/night and use of fluoride toothpaste).