Table 3 ORs of CAI among participants with concordant/discordant partners within age, education and marital status

 18-

5.71**(1.62–20.08)

1.00^‡

0.96(0.72–1.27)

1.20(0.80–1.80)

0.80(0.41–1.56)

1.84(0.65–5.22)

 26-

2.92 (0.48–17.71)

1.45*(1.03–2.05)

1.00^‡

1.21 (0.81–1.83)

2.72*(1.17–6.33)

0.97(0.29–3.30)

 31-

1.81 (0.11–29.59)

0.77 (0.48–1.24)

1.31 (0.87–1.99)

1.00^‡

1.73 (0.86–3.47)

9.07*(1.07–79.67)

 41-

–

1.03 (0.43–2.50)

0.93(0.40–2.16)

0.75(0.32–1.76)

1.00^‡

0.95(0.23–4.01)

 ≥51

–

2.50 (1.0–62.60)

0.40 (0.02–10.02)

2.20 (0.11–42.73)

0.29 (0.01–6.91)

1.00^‡

Education background

Primary school

Middle school

High school

Undergraduate

Master’s and above

Unknown

 Middle school

3.51(0.38–32.62)

1.00^‡

0.80(0.43–1.50)

0.72(0.37–1.38)

1.76(0.31–10.06)

0.93(0.43–2.03)

 High school

2.36(0.22–51.14)

1.00(0.53–1.87)

1.00^‡

0.74(0.49–1.11)

0.74(0.31–1.68)

1.04(0.49–2.20)

 Undergraduate

1.04(0.14–6.31)

1.86*(1.09–3.20)

1.20(0.91–1.58)

1.00^‡

0.72(0.47–1.08)

0.96(0.62–1.47)

 Master’s and above

–

1.07(0.14–5.56)

4.00**(1.50–11.16)

2.23*(1.16–4.47)

1.00^‡

1.07(0.14–5.56)

Marital status

Married

Unmarried

Divorced

 Married

1.00^‡

0.56**(0.13–0.98)

2.28(1.06–3.49)

 Unmarried

0.95(0.74–1.23)

1.00^‡

1.32(0.77–2.26)

 Divorced

0.31(0.01–8.87)

0.73(0.03–18.99)

1.00^‡