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Mann-Kendall test trend categories
| β | Z | Trend features |
|---|---|---|
| β > 0 | 2.58 < Z | Extremely significant increase (ESI) |
| 1.96 < Z ≤ 2.58 | Significant increase (SI) | |
| 1.65 < Z ≤ 1.96 | Slightly significant increase (SSI) | |
| Z ≤ 1.65 | Non-significant (NS) | |
| β = 0 | ||
| β < 0 | ||
| 1.65 < Z | Significant decrease (SD) |
