Table 3.

Clinical quality indicators based on the first round of nationwide mammography screening in Denmark

Clinical quality indicators	Number of women	Proportion or ratio (95% CI)	Standarda
Recall
Recalled women/all women screened			<5%
Capital Region Denmark	3982/139,987	2.8% (2.8–2.9)
Region Zealand	2477/91,113	2.7% (2.6–2.8)
North Denmark Region	2351/48,980	4.8% (4.6–5.0)
Central Denmark Region	3456/115,717	3.0% (2.9–3.1)
Region of Southern Denmark	3165/123,026	2.6% (2.5–2.7)
Total	15,431/518,823	3.0% (2.9–3.0)
Invasive breast tumors
Women with invasive cancersb/all women with cancer (including DCIS)			≥80% and ≤90%
Capital Region of Denmark	1059/1235	85.7% (83.7–87.7)
Region Zealand	753/882	85.4% (82.9–87.6)
North Denmark Region	400/434	92.2% (89.2–94.5)
Central Denmark Region	963/1096	87.9% (85.8–89.7)
Region of Southern Denmark	933/1110	84.1% (81.8–86.2)
Total	4108/4757	86.4% (85.3–87.3)
Node negative cancers
Women with node negative invasive carcinomas/women operated on for invasive carcinomasc			>70%
Capital Region of Denmark	682/1008	67.7% (64.7–70.5)
Region Zealand	500/717	69.7% (66.2–73.1)
North Denmark Region	237/385	61.6% (56.5–66.4)
Central Denmark Region	590/876	67.4% (64.1–70.5)
Region of Southern Denmark	605/892	67.8% (64.6–70.9)
Total	2614/3878	67.4% (65,9–68,9)
Small cancers
Women with invasive carcinomas ≤1 cm/women operated on for invasive carcinomasd			≥25%
Capital Region of Denmark	279/718	38.9% (35.3–42.5)
Region Zealand	274/717	38.2% (34.6–41.9)
North Denmark Region	66/228	28.9% (23.2–35.3)
Central Denmark Region	196/591	33.2% (29.4–37.1)
Region of Southern Denmark	312/840	37.1% (33.9–40.5)
Total	1127/3094	36.4% (34.7–38.1)
Ratio of surgery for benign versus malignant lesionse
Women operated on for benign lesions/women operated on for malignant lesions (incl DCIS)f			Ratio: ≤1:4
Capital Region of Denmark	131/1196	1:9.1
Region Zealand	119/857	1:7.2
North Denmark Region	119/430	1:3.6
Central Denmark Region	178/1033	1:5.8
Region of Southern Denmark	198/1147	1:5.8
Total	745/4663	1:6.3
Breast conserving therapy
Women with invasive carcinomas treated with breast conserving therapy/women operated on for invasive carcinomas			>50%
Capital Region of Denmark	811/1022	79.4% (76.7–81.8)
Region Zealand	628/726	86.5% (83.8–88.9)
North Denmark Region	271/389	69.7% (64.8–74.2)
Central Denmark Region	670/887	75.5% (72.6–78.3)
Region of Southern Denmark	770/905	85.1% (82.6–87.3)
Total	3150/3929	80.2% (78.9–81.4)

Notes:

^aStandards for each quality indicator are defined by the steering committee for the Danish Quality Database of Mammography Screening (DKMS) based on the fourth edition of the European Guidelines for Quality Assurance in Breast Cancer Screening and Diagnosis;¹¹

^bincludes women diagnosed with invasive carcinomas, sarcomas, or malignant lymphomas. Data extracted from the DNPR;

^c51 women were excluded due to missing information on axillary status. Data extracted from the DNPR;

^d835 women were excluded due to missing information on tumor size. Data extracted from the DNPR;

^eassessed as a proportion (women operated on for benign lesions/all women operated on for breast tumors) and with a standard of ≤20%, the proportions (95% CI) were: 9.9% (8.3–11.6), 12.2% (10.2–14.4), 21.7% (18.3–25.4), 14.7% (12.8–16.8), 14.7% (12.9–16.7), and 13.8% (12.9–14.7) for Capital Region of Denmark, Region Zealand, North Denmark Region, Central Denmark Region, Region of Southern Denmark, and all of Denmark, respectively;

^fdata on women operated on for a malignant lesion were extracted from the NRP. The number is not equal to the number of invasive carcinomas registered in the DNPR.

Abbreviations: CI, confidence interval; DCIS, ductal carcinoma in situ; DNPR, Danish National Pathology Registry; NRP, National Registry of Patients.