Table 4.

Studies with evidence on less studied factors Associated or NOT Associated with maternal mortality in Iran

Determinants	associated	Not associated
Preterm of gestational age	[45]	–
Obesity	[45]	–
Quality of care	[54]	–
Immune pregnancy ratio	[54, 56]	–
Human development index	[53]	–
Gender inequality in education	[53]	–
Access to improved water source	[38]	–
Fertility rate	[41]	–
Number of midwives	–	[51]
Gini coefficient	–	[22, 53]
Attendance of girls in secondary schools	–	[6, 38]
Numbers of hospital beds	–	[41]
Number of physician	–	[41]
Use of improved sanitation	–	[38]