Location | Year published | Number of Patients Enrolled | Risk Factors Identified |
Maiduguri, Northern Nigeria [4] | 1990 | 241 cases, 148 controls | Younger age at marriage, shorter height |
Northern Nigeria [6] | 1999 | 50 cases, 50 controls | Younger age at marriage, fewer parities, husband lower status occupation, husband fewer years of education |
North-Eastern Nigeria [7] | 2007 | 80 cases, 80 controls | Younger age at marriage, shorter height, illiteracy, lower social class, lack of employment, village rather than town residence, further distance from health facility |