Table 1.
Comparison of the number of screening mammograms and recall rates in the same period of 2019 and 2020.
| 2019 (Jan.–Apr.) |
2020 (Jan.–Apr.) |
Difference | p-value | ||||
|---|---|---|---|---|---|---|---|
| Numbers | Proportionc | Numbers | Proportionc | ||||
| Number of screenings | Total | 396,371 | 100% | 308,463 | 100% | −87,908 (−22.2%) | <0.001a |
| In-hospital | 151,343 | 38.2% | 95,082 | 30.8% | −56,261 (−37.2%) | <0.001a | |
| Outreach | 245,028 | 61.8% | 213,381 | 69.2% | −31,647 (−12.9%) | <0.001a | |
| Recall rate | In-hospital | 8.3% | 8.7% | 0.4% | <0.001b | ||
| Outreach | 6.6% | 6.9% | 0.3% | <0.001b | |||
a
Two-sample test for proportion to examine the screening rate differences. We used the screening rate of 39.9% in 2018 to estimate the number of eligible women and presumed they are the same in 2019 and 2020. The calculation was made by using approximate values.
b
Two-sample test for proportion to examine the recall rate differences.
c
The proportion of in-hospital screenings decreased and the proportion of outreach increased in 2020. The difference was examined using Chi-square test and showed significant difference (p < .001).