| Variables | Category | Poor knowledge (n = 37) | Good knowledge (n = 392) | COR (95 % CI) | AOR (95 % CI) | value for COR/AOR |
| First baby | No | 19 | 183 | 0.83 (0.42, 1.63) | 0.87 (0.21, 3.62) | 0.07/0.61 | Yes | 18 | 209 | 1 | 1 | | Age of the mother | <25 | 12 | 57 | 0.50 (0.19, 1.32) | 0.94 (0.22, 4.04) | 0.16/0.93 | 25–35 | 17 | 260 | 1.63 (0.68, 3.92) | 1.85 (0.52, 6.57) | 0.27/0.34 | >35 | 8 | 75 | 1 | 1 | | Educational level | certificate | 25 | 210 | 0.55 (0.27, 1.13) | 1.05 (0.36, 3.10) | 0.10/0.93 | Certificate and above | 12 | 182 | 1 | 1 | | Maternity leave | <4 months | 22 | 98 | 0.23 (0.11, 0.46) | 0.75 (0.18, 3.18) | 0.00/0.70 | 4 months | 15 | 294 | 1 | 1 | | Actual time to return back to work | <4 months | 28 | 135 | 0.17 (0.08, 0.37) | 0.15 (0.04, 0.67) | 0.00/0.01 | 4 months | 9 | 257 | 1 | 1 | | Have a private place for breastfeeding | No | 35 | 349 | 0.46 (0.11, 2.06) | 0.41 (0.06, 2.72) | 0.18/0.36 | Yes | 2 | 43 | 1 | 1 | | Occupation | Government employee | 14 | 261 | 3.1 (1.55, 6.55) | 1.79 (0.48, 6.70) | 0.002/0.39 | Private employee | 22 | 132 | 1 | 1 | | Birth at health facilities | No | 8 | 34 | 0.34 (0.14, 0.81) | 1.65 (0.41, 6.67) | 0.01/0.39 | Yes | 29 | 358 | 1 | 1 | | Support of the husband | No | 17 | 126 | 0.56 (0.26, 1.08) | 0.66 (0.21, 2.06) | 0.09/0.47 | Yes | 20 | 266 | 1 | 1 | | Residence | Urban | 19 | 286 | 2.56 (1.3, 5.06) | 3.1 (1.12, 8.57) | 0.007/0.03 | Rural | 18 | 106 | 1 | 1 | | Marital status | Married | 27 | 376 | 13.9 (0.85, 228.8) | 5.6 (1.21, 9.62) | 0.06/0.04 | Divorced | 9 | 15 | 1.67 (0.90, 30.06) | 2.77 (0.9, 12.98) | 0.73/0.13 | Widowed | 1 | 1 | 1 | 1 | |
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