| Parameter | Interpretation | Estimates | Standard error | value | 95% CI |
| β0 | Baseline total service volume in January 2019 | 114,901.5 | 4262.4 | <0.0001 | (106,279.9, 123,523.0) | β1 | Trend per month prior to March 2020 | 4,864.0 | 883.4 | <0.0001 | (3,077.1, 6,650.9) | β2 | Level change in March 2020 | −104,446.3 | 33429.1 | 0.003 | (−17,2063.1, −36,829.5) | β3 | Trend change per month after March 2020 but prior to December 2020 (relative to the pre-March 2020 trend) | 20,660.7 | 5849.8 | 0.001 | (8,828.5, 32,493.0) | β4 | Level change in December 2020 | −69,791.2 | 26603.9 | 0.012 | (−123,602.6, −15,979.7) | β5 | Trend change per month after December 2020 (relative to the March to November 2020 trend) | −24,213.9 | 5840.6 | <0.0001 | (−36,027.6, −12,400.2) |
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