Table 7.

Statistical analysis for comparison of CAD before and after the operation of SNPP.

	CAD (mSv)		Z	P
	Before (2014–2017)	After (2018–2021)
1st quarter	0.056 ± 0.023	0.089 ± 0.029	−1.443	0.149
2nd quarter	0.086 ± 0.039	0.096 ± 0.039	−0.577	0.564
3rd quarter	0.069 ± 0.011	0.090 ± 0.017	−1.155	0.248
4th quarter	0.108 ± 0.056	0.156 ± 0.088	−0.289	0.773
The total	0.319 ± 0.046	0.431 ± 0.089	−1.443	0.149