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Table 6 Bi-variable and multivariable Cox proportional hazard regression for predictors of Implanon discontinuation among women enrolled in Family planning units of public hospitals in Guraghe zone, southern Ethiopia, 2021

From: Survival time to Implanon discontinuation and its predictors among a cohort of Implanon users who enrolled in public hospitals of southern Ethiopia, 2021: a retrospective cohort study

Variable Categories

Total [n(%)]

Discontinued [n(%)]

CHR(95%CI)

AHR(95%CI)

p-value

Age of mother in years

  < 20

46(9.2)

12(5.9)

1

1

1

 20–24

36(7.2)

15(7.3)

1.40(0.66,3.00)

0.84(0.37,1.93)

0.683

 25–29

141(28.1)

45(21.9)

1.24(0.65,2.34)

1.01(0.52,1.94)

0.986

 30–34

205(40.8)

94(45.9)

1.68(0.92,3.07)*

1.54(0.82,2.89)

0.178

 35+

74(14.7)

39(19.0)

1.94(1.01,3.71)*

1.43(0.70,2.90)

0.325

Marital status

 Not in marital relation

69(13.7)

23(11.2)

1

  

 In marital union

433(86.3)

182(88.8)

1.08(0.70,1.68)

  

Residence

 Urban

295(58.8)

107(52.2)

1

1

1

 Rural

207(41.2)

98(47.8)

1.45(1.10,1.91)*

1.50(1.09.2.08)**

0.014

Parity

  ≥ 5(Grand multiparous)

116(23.1)

36(17.6)

1

  

 2–4(Multiparous)

265(52.8)

88(42.9)

1.09(0.74,1.62)

0.90(0.58,1.40)

0.639

 1(Primiparous)

92(18.3)

57(27.8)

2.01(1.32,3.05)*

1.51(0.75,2.79)

0.240

 0(Nulliparous)

29(57.8)

24(11.7)

2.89(1.72,4.85)*

2.02(1.65,3.67)

0.021

Ever got ANC service

 Yes

431(85.9)

171(83.4)

1

1

1

 No

71(14.1)

34(16.6)

1.25(0.86,1.81)

  

Ever got skilled delivery

 Yes

408(81.2)

162(79.1)

1

  

 No

94(18.7)

43(20.9)

1.06(0.75,1.48)

  

Contraceptive history

 Repeat

443(88.2)

163(79.5)

1

1

 

 New

59(11.8)

42(20.5)

1.97(1.40,2.77)*

1.79(0.89,2.96)

0.061

Types of contraceptives previously used (n = 443)

 Condom

24(5.4)

17(9.4)

1

1

 

 IUCD

27(6.1)

17(9.4)

0.58(0.29,1.14)

0.56(0.26,1.21)

0.141

 Oral contraceptives

98(22.1)

46(25.4)

0.37(0.21,0.65)*

0.58(0.32,1.06)

0.078

 Injectable

178(40.2)

71(39.2)

0.38(0.22,0.64)*

0.532(0.27,1.05)

0.069

 Implants

98(22.1)

30(16.6)

0.30(0.17,0.55)

0.47(0.25,0.87)**

0.016

Previous history of abortion

 No

414(82.5)

163(79.5)

1

1

 

 Yes

88(17.5)

42(20.5)

1.02(0.72,1.43)*

1.59(0.83,2.44)

 

Having a diagnosed HTN

 No

432(86.1)

169(82.4)

1

1

 

 Yes

70(13.9)

36(17.6)

1.63(1.14,2.35)*

1.59(0.93,2.44)

0.055

Counseled before insertion

 Yes

441(87.8)

151(73.7)

1

1

 

 No

61(12.2)

54(26.3)

2.73(2.00,3.73)*

2.4(1.72,3.70)**

0.021

Heavy and prolonged vaginal bleeding

 No

388(67.3)

101(49.3)

1

1

1

 Yes

114(22.7)

104(50.7)

4.88(3.70,6.44)*

3.91(2.67,5.32)**

< 0.001

Weight gain

 No

445(88.6)

171(83.4)

1

1

 

 Yes

57(11.4)

34(16.6)

1.36(0.91,2.05)*

1.152(0.74,1.885)

 

Having post-insertion follow up

 Yes

219(43.6)

34(16.6)

1

1

1

 No

283(56.4)

171(83.4)

4.09(2.83,5.91)*

3.15(2.11,4.71)*

< 0.001

  1. Key: 1: Reference category; AHR Adjusted hazard ratio, CHR Crude Hazard ratio, *statistically significant at p-value< 0.1, ** statistically significant at p-value < 0.05