Table 4. Reported clinical symptoms among study participants by age group and sex, Mongolia, 2010 to 2012 (n = 2856).

Symptoms	n	Age group						Sex		p value*
		0–9	10–14	15–19	20–44	45 and above	p value*	Male	Female
		%	%	%	%	%		%	%
Fever	135	0.7	1.6	0.7	52.6	44.4	0.009	3.8	5.4	0.053
Headache	1268	0.3	0.7	2.0	57.9	39.1	< 0.001	34.3	51.8	< 0.001
Joint pain	1287	0.4	0.5	1.5	50.7	46.9	< 0.001	38.7	49.5	< 0.001
Back pain	1351	0.1	0.4	1.4	57.6	40.5	< 0.001	43.6	49.8	0.001
Muscle pain	590	0.5	1.0	1.0	46.4	51.1	< 0.001	14.9	24.7	< 0.001
Weakness	964	0.3	0.3	0.4	50.7	48.3	< 0.001	26.9	38.6	< 0.001
Night sweats	336	0.9	0.6	0.6	45.8	52.1	< 0.001	11.4	12.0	0.812
Sleeping disturbance	530	0.2	–	0.4	42.3	57.1	< 0.001	14.5	21.4	< 0.001
Weight loss	233	1.3	1.3	1.3	40.7	55.4	< 0.001	7.2	8.8	0.115
Miscarriage	31	–	–	–	90.3	9.7	0.015	–	100.0	< 0.001
Testicular pain	10	–	–	–	50.0	50.0	0.749	100.0	–	< 0.001

* Either derived from the χ² test or Fisher’s exact test.