Table 5.

Case-Control Studies on the Association of NPC with Socioeconomic Factors

Factors	Study	Exposure	P-value
Occupational exposure	Hashim et al, 2012	No Yes	<0.001
	Guo et al., (2009)	<10 years ≥10 years	0.99 0.001
Dust exposure	Lourembam et al., (2015)	Ever	0.21
Type of household	Liu et al., (2017)	Building/concrete Cottage/clay brick.	<0.001
	He et al., (2015)	Block Bungalow	<0.001
	Xie et al., (2015)	Public rental housing estates Homeownership scheme courts Private mansion houses Private tenement houses	<0.001
	Lakhanpal et al., (2014)	Brick/concrete Mud Semi-brick/concrete	- 0.02 0.99
Poor ventilated house.	Lourembam et al., (2015)	Poor ventilated house	0.0032
Smoke Exposure	Lourembam et al., (2015)	Smoke Exposure	0.0007
Cooking experience at home	Xie et al., (2015)	Cooking fumes	0.005