Table 3.
Orders* |
Instances* |
|||
---|---|---|---|---|
Tests | Value | p Value† | Value | p Value† |
Magnesium | ||||
Mean weekly tests during baseline period | 234 | — | 539 | — |
Baseline trend in weekly tests | 0.1 | 0.845 | −0.5 | 0.163 |
Weekly test rate after the first intervention‡ | 219 | 0.640 | 378 | 0.001 |
Weekly test rate after the second intervention | 485 | <0.001 | 491 | 0.022 |
Trend change in the weekly test rate after the second intervention | 0.6 | 0.315 | 1.5 | 0.050 |
Weekly test rate after the third intervention | 230 | <0.001 | 277 | <0.001 |
Trend change in the weekly test rate related the third intervention | 0.9 | 0.076 | 1.6 | 0.007 |
Mean weekly test rate at the end of study period | 320 | — | 379 | — |
Calcium | ||||
Mean weekly tests during baseline period | 200 | — | 400 | — |
Baseline trend in weekly tests | 0.1 | 0.924 | −0.5 | 0.361 |
Weekly test rate after the first intervention‡ | 190 | 0.822 | 336 | 0.643 |
Weekly test rate after the second intervention | 368 | 0.113 | 452 | 0.541 |
Trend change in the weekly test rate after the second intervention | 2.5 | 0.012 | 3.6 | 0.003 |
Weekly test rate after the third intervention | 462 | 0.045 | 621 | 0.001 |
Trend change in the weekly test rate related the third intervention | 7.6 | < 0.001 | 8.0 | < 0.001 |
Mean weekly test rate at the end of study period | 1259 | — | 1417 | — |
Phosphorus | ||||
Mean weekly tests during baseline period | 108 | — | 282 | — |
Baseline trend in weekly tests | 0.1 | 0.662 | 0.1 | 0.777 |
Weekly test rate after the first intervention‡ | 107 | 0.823 | 227 | 0.056 |
Weekly test rate after the second intervention | 292 | < 0.001 | 313 | 0.011 |
Trend change in the weekly test rate after the second intervention | 1.1 | 0.008 | 1.5 | 0.015 |
Weekly test rate after the third intervention | 229 | 0.008 | 289 | 0.189 |
Trend change in the weekly test rate related the third intervention | 0.7 | 0.054 | 0.8 | 0.057 |
Mean weekly test rate at the end of study period | 309 | — | 363 | — |
All outcomes are corrected for changes in weekly admission rates.
p Values for “weekly test rate” tests the hypothesis that the current rate is the same as the preceding rate. p Values for “trend change” tests the hypothesis that the current trend is equal to zero.
Trends during the period when the first tool was implemented could not be tested due to inadequate sample.