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Cluster centroids of callers within the Pre–COVID-19 period.
| Caller type | Average number of calls | Mean duration | Standard deviation of duration | Cluster size | Within sum of squares |
| Typical | 3.685639 | 213.3336 | 48.00642 | 2284 | 501.3016 |
| High Frequency | 424.8 | 294.3486 | 419.1129 | 35 | 868.5136 |
| Regular | 22.039326 | 675.4679 | 725.19471 | 712 | 658.9827 |
| Unpredictable | 9.686636 | 1586.4138 | 1626.68238 | 217 | 430.4528 |
| Single Lengthy | 1.126984 | 1977.2117 | 33.53513 | 504 | 600.5583 |
