Table 2.
Clinical quality indicator results from the first three national screening rounds in Denmark
| Indicator | Standard | Round III, missing (%) | Round I, proportion or ratio (95% CI) | Round II, proportion or ratio (95% CI) | Round III, proportion or ratio (95% CI) |
|---|---|---|---|---|---|
| Recall: women recalled for clinical mammography/all women screened | <3% | – | 3.0 (2.9–3.0) | 2.7 (2.6–2.7) | 2.7 (2.7–2.7) |
| Interval cancer: women with cancer detected within 12 months after screening/underlying incidence of cancera | <30% | – | Not relevant | 26.4 (23.9–29.0) | 25.7 (23.3–28.4) |
| Interval cancer: women with cancer detected within 12–24 months after screening/underlying incidence of cancera | <50% | – | Not relevant | 37.3 (34.4–40.4) | 50.0 (46.5–53.6) |
| Invasive breast tumors: women with invasive breast tumors/women with any breast cancer including DCIS | ≥80% and ≤90% | – | 87.4 (86.5–88.4) | 86.3 (85.0–87.5) | 86.4 (85.2–87.5) |
| Node-negative cancer: women operated for node-negative invasive carcinomas/all women operated for invasive carcinomas | >75% | 1.9 | 69.8 (68.4–71.2) | 79.1 (77.5–80.7) | 82.0 (80.6–83.3) |
| Small cancers: women operated for invasive carcinomas ≤10 mm/all women operated for invasive carcinomas | >30% | 5.8 | 36.1 (34.4–37.8) | 39.9 (38.0–41.9) | 40.1 (38.3–41.8) |
| Ratio of surgery for benign vs malignant lesions: women with surgery for benign breast tumor/women with surgery for malignant breast tumor | Maximum 1:4 | – | 1:5.8 (1:5.5–1:6.2) | 1:6.9 (1:6.3–1:7.6) | 1:8.1 (1:7.5–1:8.9) |
| Breast-conserving therapy: women with invasive carcinomas treated with breast-conserving therapy/women operated for invasive carcinomas | >60% | – | 80.0 (78.7–81.2) | 81.3 (79.7–82.8) | 83.0 (81.5–84.4) |
Notes: Standard: the acceptable level of quality for each indicator defined by the steering committee for DKMS.
a
The nominator is the incidence of interval cancer per 100,000 women within 12 months and 12–24 months of screening. The denominator is the background incidence of breast cancer in Denmark in 2006 per 100,000 women.
Abbreviations: DCIS, ductal carcinoma in situ; DKMS, Danish Quality Database for Mammography Screening; CI, confidence interval.