Variables

Total cases
(N=619)

Positive contacts

P value

N

Percentage(%)

Whether to test if at risk of infection

0.875

Yes

614

141

23.0

No

5

1

20.0

Whether inform sexual partners of their high-risk behavior

0.281

Yes

576

135

23.4

No

43

7

16.3

Sexual intercourse with others

0.584

Yes

612

141

23.0

No

7

1

14.3

Whether condoms are used during sex

0.952

Never Use:

123

30

24.4

 Sometimes Use

426

98

23.0

Always Use

54

13

24.1

No sexual Activity

7

1

14.3

Frequency of Unprotected Sexual Activity per Month

0.490

<1 time/week

184

48

26.1

1 time/week

180

35

19.4

2 times/week

140

36

25.7

≥3 times/week

54

9

16.7

Protective Sexual Activity

54

13

24.1

No sexual Activity

7

1

14.3

Heterosexual sex with spouse in the last year

0.490

Yes

236

49

20.8

No

376

92

24.5

No sexual Activity*

7

1

14.3

male-to-male sex with a Male regular sexual partner in the last year

0.300

Yes

48

7

14.6

No

564

134

23.8

No sexual Activity*

7

1

14.3

Sex with a Heterosexual regular sexual partner, other than the spouse, in the last year

0.822

Yes

129

31

24.0

No

483

110

22.8

No sexual Activity*

7

1

14.3

Sex with a casual heterosexual partner in the last year

0.525

Yes

213

54

25.4

No

399

87

21.8

No sexual Activity*

7

1

14.3

Variables

N

Contact HIV test results

P value

Multifactor logistic regression analysis

(N=619)

Positive(N=142)

Negtive(N=477)

OR（95%CI）

P value

Gender

<0.001

Male

415

64(15.4)

351(84.6)

1

Female

204

78(38.2)

126(61.8)

3.088(2.075,4.596)

<0.001

Age

0.174

＜25

65

11(16.9)

54(83.1)

25~34

108

18(16.7)

90(83.3)

35~44

129

29(22.5)

100(77.5)

45~54

163

41(25.2)

122(74.8)

≥55

154

43(27.9)

111(72.1)

Education level

0.004

Junior High School or Below

409

109(26.7)

300(73.3)

High School or Technical School

89

18(20.2)

71(79.8)

College or Above

121

15(12.4)

106(87.6)

Occupation

0.011

Farmer

209

59(28.2)

150(71.8)

Migrant worker

150

22(14.7)

128(85.3)

Unemployed

116

32(27.6)

84(72.4)

Worker/Student/
Others

144

29(20.1)

115(79.9)

Current Residence

0.004

Main City Area

270

47(17.4)

223(82.6)

Other Urban Areas

349

95(27.2)

254(72.8)

Marital Status

<0.001

Unmarried

192

22(11.5)

170(88.5)

Married with Spouse

265

80(30.2)

185(69.8)

Divorced or Separated

130

33(25.4)

97(74.6)

Widowed/Living Together

32

7(21.9)

25(78.1)

Living Condition

0.003

Living Alone

280

45(16.1)

235(83.9)

Living with Spouse/Regular sexual Partner

292

84(28.8)

208(71.2)

Living with Children

32

9(28.1)

23(71.9)

Others

15

4(26.7)

11(73.3)

Monthly Income Level

0.132

＜1000

70

16(22.9)

54(77.1)

1000-2000

108

18(16.7)

90(83.3)

2000-3500

272

75(27.6)

197(72.4)

3500-5000

129

24(18.6)

105(81.4)

＞5000

40

9(22.5)

31(77.5)

Contact Tracing Investigation Location

0.016

CDC/Community Health Center

390

95(24.4)

295(75.6)

Hospital

91

28(30.8)

63(69.2)

Social Organization

137

19(13.9)

118(86.1)

Detoxification Center*

1

0(0.0)

1(100.0)

Types of Sexual Partners for Seeds

<0.001

Heterosexual Regular Partner

410

75(18.3)

335(81.7)

1

Spouse

207

67(32.4)

140(67.6)

1.849(1.236,2.765)

0.003

Method of Sexual Activity

0.433

Heterosexual Activity

524

125(23.9)

399(76.1)

Same-Sex Activity

88

16(18.2)

72(81.8)

nonsexual behavior*

7

0(0.0)

7(100.0)

Variables

Female Traceability Contacts

Spouse Traceability Contacts

N=301

Percentage(%)

N=244

Percentage(%)

Age

＜35

46

15.2

34

13.9

35~44

77

25.6

52

21.3

45~54

92

30.6

77

31.6

≥55

86

28.6

81

33.2

Ethnicity

Han

270

89.7

218

89.3

Minority Ethnicity

31

10.3

26

10.7

Education Level

Junior High School or Below

243

80.7

212

86.9

High School or Technical School

45

15

25

10.2

College or Above

13

4.3

7

2.9

Occupation

Farmer

111

36.9

112

45.9

Migrant worker

84

27.9

38

15.5

Unemployed

46

15.3

47

19.3

Worker/Student/Other

60

19.9

47

19.3

Current Residence

Main City Area

242

80.4

225

92.2

Other Urban Areas

59

19.6

19

7.8

Marital Status

Unmarried

60

19.9

9

3.7

Married with Spouse

136

45.2

236

95.5

Divorced or Separated

16

5.3

1

0.4

Widowed/Living Together

89

29.6

1

0.4

Duration of Relationship

≤1year

116

38.5

8

3.3

2-4 years

54

17.9

18

7.4

≥5 years

131

43.6

218

89.3

Method of Introduction

Dance Hall/Bar/Public Places

13

4.3

1

0.4

Social Apps

36

12

4

1.6

Introduced by Acquaintance/Friend

252

83.7

239

98.0

Whether condoms are used during sex

Never Use

77

25.6

78

32

Sometimes Use

171

56.5

131

53.7

Always Use

53

17.9

35

14.3

Frequency of Unprotected Sexual Activity per Month

＜1 time/week

144

47.8

123

50.4

1 time/week

100

33.2

82

33.6

2 times/week

48

15.9

28

11.5

≥3 times/week

9

3.1

11

4.5

Relationship Status with the Seed

Continue

211

70.1

240

98.4

Ended

90

29.9

4

1.6

Ways of Being Informed

Informed by the Infected Person

177

58.8

141

57.8

Informed by the Follow-Up Person

56

18.6

41

16.8

Joint Notification

68

22.6

62

25.4

HIV Testing Result

Positive

97

32.2

77

31.6

Negative

204

67.8

167

68.4