TABLE 2—
Effect of 2-Way Short Message Service (SMS) on Contraceptive Method Use and Method Satisfaction: Kenya, 2016–2017
| Time Point | 2-Way SMS, No. (%) | Control, No. (%) | RR (95% CI) | ARR (95% CI)a |
| 6 wk | ||||
| Any method use | 22 (22.7) | 23 (22.8) | 1.00 (0.60, 1.66) | 1.04 (0.61, 1.76) |
| HEC useb | 14 (14.4) | 19 (18.8) | 0.77 (0.41, 1.44) | 0.86 (0.45, 1.65) |
| LARC/PC use | 6 (6.2) | 10 (9.9) | 0.62 (0.24, 1.65) | 0.66 (0.22, 1.95) |
| 14 wk | ||||
| Any method use | 67 (59.3) | 61 (53.0) | 1.12 (0.89, 1.41) | 1.09 (0.86, 1.38) |
| HEC use | 58 (51.3) | 54 (47.0) | 1.09 (0.84, 1.42) | 1.07 (0.81, 1.41) |
| LARC/PC use | 26 (23.0) | 24 (20.9) | 1.10 (0.68, 1.80) | 1.04 (0.63, 1.71) |
| Satisfied with methodc,d | 62 (91.2) | 52 (86.7) | 1.05 (0.93, 1.19) | 1.07 (0.95, 1.20) |
| 6 mo | ||||
| Any method use | 93 (75.6) | 83 (64.3) | 1.18 (1.00, 1.38) | 1.19 (1.01, 1.41) |
| HEC usee | 86 (69.9) | 74 (57.4) | 1.22 (1.01, 1.47) | 1.26 (1.04, 1.52) |
| LARC/PC use | 34 (27.6) | 36 (27.9) | 1.00 (0.67, 1.48) | 0.92 (0.62, 1.38) |
| Satisfied with methodc,f | 86 (94.5) | 83 (97.7) | 0.97 (0.91, 1.03) | 0.96 (0.91, 1.02) |
Note. ARR = adjusted relative risk; CI = confidence interval; HEC = highly effective contraceptive; LARC = long-acting reversible contraception (implant, intrauterine device); PC = permanent contraception (bilateral tubal ligation); RR = relative risk.
a
ARR computed by Poisson regression with robust standard errors, adjusted for education, category, parity, and desire for future children.
b
Includes hormonal, intrauterine, and permanent contraception.
c
Satisfied or highly satisfied with method on 5-point Likert scale.
d
n = 128.
e
Primary outcome.
f
n = 178.