OBJECTIVES To explore performance measures among non-immigrants and immigrants attending BreastScreen Norway. METHODS We analysed data from 2,951,375 screening examinations among non-immigrants and 153,026 among immigrants from 1996 to 2015. Immigrants were categorised into high- and low-incidence countries according to the incidence of breast cancer in their birth country. Performance measures, including attendance and recall rates, rates of screen-detected cancer (SDC) and interval breast cancer (IBC), positive predictive value (PPV) and histopathological tumour characteristics, were analysed. We used Fisher's exact model and t tests for descriptive statistics, and Poisson regression, adjusting for age and screening history, comparing results for non-immigrants versus immigrants. RESULTS Attendance rates were 78% for non-immigrants and 56% for immigrants (p < 0.001). Rates of prevalent screens were 24% for non-immigrants and 32% for immigrants (p < 0.001). Immigrants from low-incidence countries were younger at diagnosis than non-immigrants (57 years versus 60 years, p < 0.001). Recall rates were 3.1% for non-immigrants and 3.8% for immigrants (p < 0.001), while PPVs were 17% and 14% (p < 0.001), respectively. IBCs in immigrants from low-incidence countries were more often triple negative (RRadj 1.81, 95% CI 1.11-2.94) than those in non-immigrants. Both SDC and IBC in immigrants from low-incidence countries tended more often to be histological grade 3 than those in non-immigrants. CONCLUSION Immigrants had lower attendance rates, higher recall rates and lower PPV than non-immigrants. The optimal age range and screening interval for immigrant women from low-incidence countries need to be further investigated. KEY POINTS • Immigrants from countries with a low incidence of breast cancer had their breast cancer diagnosed at a younger age than non-immigrants. • Interval breast cancers detected in immigrants from countries with a low incidence of breast cancers were more often triple negative than those in non-immigrants. • The optimal age range and screening interval for immigrant women from low-incidence countries and non-immigrants might differ.

中文翻译：

---

参加挪威乳腺癌筛查计划的非移民和移民的绩效衡量：基于人口的筛查计划。

目的探讨参加挪威乳腺癌筛查计划的非移民和移民的绩效指标。方法我们分析了1996年至2015年非移民的2,951,375例筛查数据和移民中的153,026筛查数据。根据出生国乳腺癌的发生率，将移民分为高发和低发国家。分析了绩效指标，包括出勤率和召回率，筛查癌症（SDC）和间歇性乳腺癌（IBC）的比率，阳性预测值（PPV）和组织病理学肿瘤特征。我们使用Fisher的精确模型和t检验进行描述性统计，并使用Poisson回归，调整年龄和筛查历史，比较非移民与移民的结果。结果非移民出勤率为78％，移民出勤率为56％（p <0.001）。非移民的普遍筛查率为24％，移民为32％（p <0.001）。来自低发病率国家的移民在诊断时比非移民年轻（57岁对60岁，p <0.001）。非移民的召回率为3.1％，移民的召回率为3.8％（p <0.001），而PPV分别为17％和14％（p <0.001）。来自低收入国家的移民中的中型散客比非移民中的IBC更常见三重阴性（RRadj 1.81，95％CI 1.11-2.94）。来自低发病率国家的移民的SDC和IBC往往比非移民的组织学等级为3级。结论移民的出勤率，回想率和PPV均低于非移民。来自低发病率国家的移民妇女的最佳年龄范围和筛查间隔需要进一步调查。要点•乳腺癌发病率较低的国家的移民被诊断出的乳腺癌比非移民年轻。•在乳腺癌发病率低的国家的移民中发现的间隔性乳腺癌通常比非移民中的三阴性。•来自低发病率国家的移民妇女与非移民的最佳年龄范围和筛查间隔可能不同。•在乳腺癌发病率低的国家的移民中发现的间隔性乳腺癌通常比非移民中的三阴性。•来自低发病率国家的移民妇女与非移民的最佳年龄范围和筛查间隔可能不同。•在乳腺癌发病率低的国家的移民中发现的间隔性乳腺癌通常比非移民中的三阴性。•来自低发病率国家的移民妇女与非移民的最佳年龄范围和筛查间隔可能不同。