is a better indication, next is electric power consumption  IMO.

Some interesting facts:

1)Hindi household size = 4.8 person , 92% of hindi rural husehold have income < 10000 rupee/month

https://timesofindia.indiatimes.com/india/92-rural-homes-run-on-less-than-Rs-10000-per-month/articleshow/47931716.cms

https://www.indiatimes.com/news/more-from-india/size-of-indian-families-5-interesting-facts-155086.html#2

Chinese poverty line is 2300 yuan/person/yr(set in 2011), a poor chinese family of 4.8 at yuan-to-rupee exchange rate of 10.5 has an income of 8050 rupee/month or less . And china has 'only' 43 million poor . Even if the hindu data might not the most recent,You can figure out the rest

http://zzwave.com/plaboard/posts/3955677.shtml