[Retracted] Environmental Healthcare Assessment via Daily-Scale Drought Monitoring

Table 1

Categories of drought grade for the SWAP.

SWAP value	Probability of occurrence	Drought condition
(−0.84, −0.52]	(0.20, 0.30]	Mild drought
(−1.28, −0.84]	(0.10, 0.20]	Moderate drought
(−1.64, −1.28]	(0.05, 0.10]	Severe drought
(−2.05, −1.64]	(0.02, 0.05]	Extreme drought
<−2.05	<0.02	Exceptional drought