Self-reported prevalence of periodontal disease among the Spanish population and immigrants: 2006, 2011/12 and 2017: a population-based study

Table 1 Prevalence and proportions of the self-reported variables, namely, bleeding gums, tooth mobility, tooth extraction and missing teeth, in immigrants and Spanish nationals in the NHS-2006, NHS-2011/2012 and NHS-2007

	Bleeding gums					Tooth mobility					Tooth extraction					Missing teeth
	NHS-2006					NHS-2006					NHS-2006					NHS-2006
	Immigrant		Spanish		p value of the chi-square test	Immigrant		Spanish		p value of the chi-square test	Immigrant		Spanish		p value of the chi-square test	Immigrant		Spanish		p value of the chi-square test
	F	%	F	%	p value of the chi-square test	F	%	F	%	p value of the chi-square test	F	%	F	%	p value of the chi-square test	F	%	F	%	p value of the chi-square test
Yes	994	23.40	6970	21.07	0.000	207	4.87	2562	7.74	0.000	2494	58.72	24,077	72.78	0.000	1886	44.41	15,869	47.97	0.000
No	3130	73.70	25,439	76.90		3890	91.59	29,839	90.20		1633	38.45	8431	25.49		2205	51.92	15,534	46.96
Not recorded	123	2.90	671	2.03		150	3.53	679	2.05		120	2.83	572	1.73		156	3.67	1677	5.07
Total	4247	100.00	33,080	100.00		4247	100.00	33,080	100.00		4247	100.00	33,080	100.00		4247	100.00	33,080	100.00
	NHS-2011/2012					NHS-2011/2012					NHS-2011/2012					NHS-2011/2012
Yes	923	16.38	5650	17.07	0.076	206	3.70	2179	6.57	0.000	3283	58.93	23,922	72.15	0.000	2538	45.56	16,706	50.39	0.000
No	4623	82.03	27,416	82.85		5340	95.85	30,882	93.14		2263	40.62	9171	27.66		3010	54.03	16,389	49.43
Not recorded	90	1.60	25	0.08		25	0.45	95	0.29		25	0.45	63	0.19		23	0.41	61	0.18
Total	5636	100.00	33,091	100.00		5571	100.00	33,156	100.00		5571	100.00	33,156	100.00		5571	100.00	33,156	100.00
	NHS-2017					NHS-2017					NHS-2017					NHS-2017
Yes	864	16.13	5585	16.57	0.000	226	4.22	1767	5.24	0.001	3610	67.39	25,031	74.25	0.000	3056	57.05	19,269	57.16	0.518
No	4475	83.54	28,105	83.37		5122	95.61	31,916	94.67		1745	32.57	8665	25.70		2296	42.86	14,426	42.79
Not recorded	18	0.34	22	0.07		9	0.17	29	0.09		2	0.04	16	0.05		5	0.09	17	0.05
Total	5357	100.00	33,712	100.00		5357	100.00	33,712	100.00		5357	100.00	33,712	100.00		5357	100.00	33,712	100.00

The chi-square test was used to assess the associations between nationality and each of the self-reported variables. A p value < 0.05 was considered statistically significant. F: frequency; %: percentage

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