Table 4 Studies with evidence on less studied factors Associated or NOT Associated with maternal mortality in Iran

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]