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| SPI | SPEI | DRI |
| Our study 2014-2023, Iraq | 0.5 to 1.5 in the rainy years, −0.5 to −1 as moderately dry | −1.5 to −2.5 which means severely dry | 0 to −1 was dry and moderately dry |
| M. Afzal1 and R. Ragab, Yorkshire, UK, [10] | 1996 when SPI indices were well Below −2, “extreme drought” level. | 1996 when SPEI indices were well Below −2, “extreme drought” level. | less than −1 |
| McKee et al., 1993, Colorado, USA [8] | above 2.0 extremely wet, 1.5 - 1.99 very wet, 1.0 - 1.49 moderately wet, −0.99 to 0.99 near normal, −1.0 to −1.49 moderately dry, −1.5 to −1.99 severely dry and −2.0 and less, extremely dry |
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