5. My job is difficult in that it requires a high level of knowledge and technical skill.						6. I need to be constantly thinking about work throughout the working day.						7. My job requires a lot of physical work.						Overall level of how demanding the job is
			Yes			No		Test	Yes			No		Test	Yes			No		Test	Yes on 6 or 7 items			Yes on fewer than 6 items		Test
		n	696			254			660			290			183			767			371			579
Mean age
			47.3	±8.4		47.6	±9.2	n.s.	46.8	±8.4		48.6	±9.0	p=0.003	46.0	±8.7		47.7	±8.5	p=0.015	45.9	±8.3		48.3	±8.7	p<0.001
Mean number of present teeth
			27.2	±6.4		26.8	±6.9	n.s.	27.3	±6.5		26.7	±6.6	n.s.	26.8	±7.6		27.2	±6.3	n.s.	27.1	±7.1		27.1	±6.1	n.s.
			%	n		%	n		%	n		%	n		%	n		%	n		%	n		%	n
Experience of tooth loss
			45.1	314		46.1	117	n.s.	43.5	287		49.7	144	n.s.	47.0	86		45.0	345	n.s.	41.0	152		48.2	279	p=0.002
Presence of decayed teeth (one or more)
			20.5	143		18.9	48	n.s.	21.2	140		17.6	51	n.s.	22.4	41		19.6	150	n.s.	22.6	84		18.5	107	n.s.
Oral problems
	Frequent stomatitis
			11.1	77		12.2	31	n.s.	12.3	81		9.3	27	n.s.	15.3	28		10.4	80	n.s.	13.7	51		9.8	57	n.s.
	Frequent tooth or gingival pain
			8.8	61		7.1	18	n.s.	9.1	60		6.6	19	n.s.	11.5	21		7.6	58	n.s.	10.0	37		7.3	42	n.s.
	Pain when consuming something cold
			14.5	101		11.4	29	n.s.	15.0	99		10.7	31	n.s.	16.9	31		12.9	99	n.s.	14.3	53		13.3	77	n.s.
	Gingival bleeding
			12.9	90		13.0	33	n.s.	13.3	88		12.1	35	n.s.	15.8	29		12.3	94	n.s.	14.0	52		12.3	71	n.s.
	Gingival swelling
			9.8	68		5.1	13	p=0.023	9.7	64		5.9	17	n.s.	9.8	18		8.2	63	n.s.	9.4	35		7.9	46	n.s.
	Gingival recession
			11.6	81		10.6	27	n.s.	13.0	86		7.6	22	p=0.015	8.7	16		12.0	92	n.s.	12.1	45		10.9	63	n.s.
	Often get food stuck between teeth
			21.1	147		17.7	45	n.s.	21.8	144		16.6	48	n.s.	21.9	40		19.8	152	n.s.	23.7	88		18.0	104	p=0.030
	Loose teeth
			3.3	23		3.1	8	n.s.	3.5	23		2.8	8	n.s.	4.4	8		3.0	23	n.s.	4.0	15		2.8	16	n.s.
	Cannot eat some foods
			1.4	10		0.4	1	n.s.	1.4	9		0.7	2	n.s.	1.6	3		1.0	8	n.s.	2.4	9		0.3	2	p=0.005
	Dry mouth
			6.8	47		9.4	24	n.s.	7.0	46		8.6	25	n.s.	8.7	16		7.2	55	n.s.	7.8	29		7.3	42	n.s.
	Inside of mouth feels slimy
			16.7	116		15.0	38	n.s.	17.0	112		14.5	42	n.s.	18.0	33		15.8	121	n.s.	18.9	70		14.5	84	n.s.
	Bad breath
			20.7	144		20.9	53	n.s.	22.3	147		17.2	50	n.s.	24.0	44		19.9	153	n.s.	24.3	90		18.5	107	p=0.032
	Jaw makes clicking sound
			5.9	41		5.5	14	n.s.	7.0	46		3.1	9	p=0.019	8.2	15		5.2	40	n.s.	7.8	29		4.5	26	p=0.032
	Jaw pain
			1.0	7		1.2	3	n.s.	1.4	9		0.3	1	n.s.	1.6	3		0.9	7	n.s.	1.6	6		0.7	4	n.s.
	Difficulty opening mouth
			2.2	15		0.8	2	n.s.	2.3	15		0.7	2	n.s.	3.3	6		1.4	11	n.s.	2.4	9		1.4	8	n.s.
	Teeth are worn down
			6.3	44		4.7	12	n.s.	6.2	41		5.2	15	n.s.	1.6	3		6.9	53	p=0.005	4.9	18		6.6	38	n.s.

The Mann-Whitney U test or chi-squred test was used to compare between two groups.