Epidemiological survey of cystic echinococcosis in southwest China: From the Qinghai-Tibet plateau to the area of Yunnan

Table 1 Distribution of echinococcosis by sex, age, ethnicity, and occupation in Yunnan

Features	Number of cases	Constituent ratio (%)
Sex
Male	185	46.6
Female	212	53.4
Age (yr)
1-9	15	3.8
10-19	29	7.3
20-29	43	10.8
30-39	69	17.4
40-49	73	18.4
50-59	66	16.6
60-69	58	14.6
70-79	37	9.3
≥ 80	7	1.8
Ethnicity
Han	173	43.6
Bai	104	26.2
Tibetan	36	9.1
Yi	31	7.8
Lisu	11	2.8
Naxi	10	2.5
Dai	6	1.5
Hani	6	1.5
Others	20	5.0
Occupation
Farmers and herders	298	75.1
Students	36	9.1
Cadre	28	7.1
Businessmen/individual	10	2.5
Children	10	2.5
Retired personnel	5	1.3
Guides	4	1.0
Others	6	1.5

Table 2 Logistic regression analysis of single risk factors of infection

Factors	Regression coefficient	Standard error	P value	Risk ratio (95%CI)
Sex	0.627	0.402	0.119	1.872 (0.852-4.115)
Age group	0.514	0.128	0.000	1.672 (1.301-2.149)
Ethnicity	0.077	0.118	0.514	1.080 (0.857-1.361)
Occupation	-0.043	0.445	0.923	0.958 (0.400-2.292)
Education level	0.637	0.281	0.023	1.891 (1.091-3.279)
YTWSEA	-0.008	0.081	0.926	0.992 (0.846-1.164)
YHDIYF	1.040	0.228	0.000	2.830 (1.809-4.429)
YUCDB	-1.029	0.717	0.151	0.357 (0.088-1.457)
YWHPME	0.630	0.269	0.019	1.877 (1.109-3.177)
HYDWW	-0.122	0.235	0.602	0.885 (0.559-1.402)

CI: Confidence interval; YTWSEA: Have you travelled, worked, or stayed in echinococcosis endemic areas; YHDIYF: Do you, or have you ever had dogs in your family? YUCDB: Did your family use cow dung to burn? YWHPME: Do you wash your hands before preparing meals or eating? HYDWW: Have you drunk wild water?

Table 3 Logistic regression analysis of multiple factors

Factors	Regression coefficient	Standard error	P value	Risk ratio (95%CI)
Age group
1-9	19.167	0.000		2.11E+08 (2.11E + 08-2.11E + 08)
10-19	19.576	5647.366	0.997	3.18E + 08 (0-.b)
20-29	3.534	1.298	0.006	34.26 (2.689-436.552)
30-39	3.710	1.204	0.002	40.846 (3.855-432.769)
40-49	2.116	1.073	0.048	8.302 (1.014-67.938)
50-5	1.776	0.937	0.058	5.908 (0.941-37.081)
60-69	0.976	0.892	0.274	2.654 (0.462-15.253)
70-79	0.971	0.914	0.288	2.642 (0.441-15.834)
≥ 80	0c	0.000
Education level
Illiterate	2.059	3.242	0.525	7.836 (0.014-4503.762)
Elementary school	0.763	3.212	0.812	2.145 (0.004-1161.921)
Junior high school	1.123	3.225	0.728	3.073 (0.006-1708.471)
High school	2.636	3.676	0.473	13.953 (0.010-18788.338)
College and above	0c	0.00
YHDIYF
Yes	3.183	1.188	0.007	24.112 (2.347-247.666)
No	-0.013	1.260	0.992	0.987 (0.084-11.661)
Previously	2.066	1.247	0.098	7.894 (0.685-90.92)
Never	0c	0.000
YWHPME
Often	1.176	0.636	0.064	3.241 (0.932-11.270)
Occasionally	2.340	0.560	0.000	10.38 (3.464-31.101)
Not	0c	0.000

CI: Confidence interval; YTWSEA: Have you travelled, worked, or stayed in echinococcosis endemic areas; YHDIYF: Do you, or have you ever had dogs in your family? YUCDB: Did your family use cow dung to burn? YWHPME: Do you wash your hands before preparing meals or eating? HYDWW: Have you drunk wild water?