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Do the meteorological precipitation-based drought indices have the same trend and result?

As you know we have eight precipitation-based drought indices, namely precipitation-based drought indices (SPI (Standardized Precipitation Index), PNI (Percent of Normal Index), DI (Deciles index), EDI (Effective drought index), CZI (China-Z index), MCZI (Modified CZI), RAI (Rainfall Anomaly Index), and ZSI (Z-score Index)). Every of them has a special equation and they have differences in calculation. However, Salehnia et al., 2017 showed that they have similar trend but the severity of these drought indices are not the same.

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