| Categories (cost/month) in NGN | Frequency per category | Rel. frequency per category (%) | Lower bound on frequencies (95%) | Upper bound on frequencies (95%) | |
| <500 | 109 | 23.2 | 19.4 | 27.1 | |
| 500 - <1,000 | 112 | 23.9 | 20.0 | 27.7 | |
| 1,000 - <3,000 | 50 | 10.7 | 7.9 | 13.5 | |
| 3,000 - <5,000 | 23 | 4.9 | 3.0 | 6.9 | |
| 5,000 - 10,000 | 49 | 10.4 | 6.2 | 14.6 | |
| None | 126 | 26.9 | 22.9 | 30.9 | |
| Male |
|
|
|
|
|
| | 46 | 19.8 | 14.7 | 25.0 | |
| 500 - <1,000 | 60 | 25.9 | 20.2 | 31.5 | |
| 1,000 - <3,000 | 39 | 16.8 | 12.0 | 21.6 | |
| 3,000 - <5,000 | 10 | 4.3 | 1.7 | 6.9 | |
| 5,000 - 10,000 | 26 | 11.2 | 4.7 | 17.7 | |
| None | 51 | 22.0 | 16.7 | 27.3 | |
| Female |
|
|
|
|
|
| | 63 | 26.6 | 21.0 | 32.2 | |
| 500 - <1,000 | 52 | 21.9 | 16.7 | 27.2 | |
| 1,000 - <3,000 | 11 | 4.6 | 2.0 | 7.3 | |
| 3,000 - <5,000 | 13 | 5.5 | 2.6 | 8.4 | |
| 5,000 - 10,000 | 23 | 9.7 | 4.3 | 15.1 | |
| None | 75 | 31.6 | 25.7 | 37.6 |