**3.4 Total monthly income**

An average subjects enrolled in all the BMI classes had their monthly income in range from 10,000-39,000. Very few had it below 5,000. In underweight population, 18.18% had monthly income below 4999, 31.82% had it between 5000–9999, 25% in 10,000-19,999, 15.91% in 20,000–39,999 and 9.09% had it above 40,000. In normal population, 11.68% had income below 4999, 19.71% between 5000–9999, 30.66% between 10,000-19,999, 27.01% between 20,000–39,999 and 10.95% above 40,000. In overweight population 13.33% were below 4999, 16.67% between 5000–9999, 30% between 10,000-19,999, 23.33% between 20–000-39,999 and 16.67% above 40,000. And in obese class, 13.33% were below 4999, 13.33% between 5000–9999, 26.67% between 10,000-19,999, 26.67% between 20,000–39,999 and 20% was above 40,000. It was found that in underweight, more subjects had income below 5,000 compared to other classes, whereas in obese, more subjects had income above 40,000 in comparison to other classes which indirectly reflected their nutritional status (**Figure 4**).

**Figure 3.** *Paternal education according to BMI.*

*Association of Pre-Pregnancy Body Mass Index and Gestational Weight Gain with Preterm… DOI: http://dx.doi.org/10.5772/intechopen.96922*

**Figure 4.**

*Total monthly income of family according to BMI.*

**Figure 5.**

*Socio-economic status and term of delivery.*

### **3.5 Socio-economic status**

#### *3.5.1 Socio-economic status and term of delivery*

In present study, it was observed that in lower socio-economic class, incidence of pre-term birth (12%) was nearly equal to that observed in middle class (13.20%) and upper middle class (12.64%). But in upper socio-economic class, the incidence of pre-tem delivery was found 54.54%. In lower class, 86.67% had full-term and 1.33% had post-term delivery. In middle class, 84.90% and 1.89% had full-term and post-term delivery respectively. In upper middle class, 86.20% had full-term and 1.14% had post-term delivery. And in upper class, the rest of 45.54% had full-term delivery. A partial negative correlation (r = −0.116) was observed between socioeconomic status and term of delivery (**Figure 5**).

#### *3.5.2 Socio-economic status and type of delivery*

It was observed from the study that the frequency of normal delivery was lower in upper class compared to lower socio-economic class. In lower class, 58.67% had normal and 41.33% had caesarean section delivery. In middle class, 52.83% were

having normal delivery, 43.39% were having caesarean section and 3.77 were having forcep delivery. In upper middle class, 48.27% were having normal, and 51.72% were having caesarean section delivery. And in upper class, 36.36%, 54.54% and 9.09% were having normal, caesarean section and forcep type of delivery respectively. A partial positive correlation (r = 0.177), thus is obtained between socioeconomic class and type of delivery (**Figure 6**).
