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Background: Population-based cancer quality registries are of great importance for the improvement of cancer care. However, little is known about the quality of recurrence data in cancer quality registries. The aim of this study was to evaluate data quality in the regional Breast Cancer Quality Registry of Central Sweden, with emphasis on the validity of recorded information on recurrence. Methods: Validation by re-abstraction was performed on a random sample of 800 women with primary invasive breast cancer stage I-III diagnosed between 1993 and 2010, of which 400 had at least one registered recurrence and 400 had no registered recurrence. Registry data were compared with data from medical records. Exact agreement, correlation and kappa values, sensitivity and specificity were calculated. Results: Seven hundred forty-seven women (93%) were available for analysis. Exact agreement was high for diagnostics, tumor characteristics, surgery, and adjuvant oncological treatment (90% or more for most variables). The registry's sensitivity was low for regional recurrence (47%), but higher for local and distant recurrence (80% and 75%), whereas specificity was overall high (>= 95%). Combining all recurrence categories irrespective of localization improved sensitivity to 90% with a specificity of 91%. In 87% of women, the date of first recurrence according to medical records fell within +/- 90 days of the date recorded in the registry. Conclusions: While the quality of data in the regional Breast Cancer Quality Registry was generally high, data accuracy on recurrences was lower. The overall precision of identifying any recurrence, irrespective of localization, was high. However, the accuracy of classification of recurrences (local, regional or distant) was lower, with evidence of underreporting for each of the recurrence categories. Given the importance of recurrence-related outcomes in the assessment of quality of care, efforts should be made to improve the reporting of rec

Stommätning innebär att etablera, komplettera och/eller renovera stompunkter i ett stomnät. Syftet med examensarbetet är att etablera ett stomnät i plan i referenssystemet SWEREF 99 16 30 och i höjd i RH 2000 inomhus i Hus 45, Heimdall, vid Högskolan i Gävle. Det undersöks särskilt vilken relativ lägesosäkerhet som är möjlig att uppnå med avseende på de praktiska begränsningar som finns i Hus 45 med begränsad sikt mellan punkterna. Önskemålet gällande nätets relativa standardosäkerheter är 2–3 mm i plan och 1–2 mm i höjd och för att uppnå det undersöks hur nätet i plan och höjd bör planeras, markeras, mätas och beräknas. Metoden för projektet följer i stora drag rekommendationerna i HMK när det gäller stommätning, beräkning och utvärdering. Först har nätets preliminära utformning rekognoserats, vilket sedan har legat till grund för simuleringar. Dessa gjordes för att få en uppfattning om vilken kvalitet en viss nätutformning skulle ge och på så sätt kunde en så bra geometri som möjligt väljas. Tre olika planeringsförslag togs fram i både plan och höjd. Mätningarna har utförts med en totalstation, Trimble S51” och ett digitalt avvägningsinstrument, Trimble DiNi. Genom helsatsmätning och dubbelmätta längder med 45 fria stationsuppställningar i plan, och finavvägning med hjälp av 28 dubbelavvägda fixhåll som kompletterats med trigonometrisk höjdmätning, har punkterna i plan och höjd mätts in. Beräkning av koordinater och kvalitetsparametrar för nypunkterna har utförts i en nätutjämning i plan och en i höjd i programvaran SBG Geo. I plan exkluderades 34 observationer (data-snooping) från en fri utjämning, som slutligen passades in mot de kända punkterna med en plan Helmerttransformation. Kvalitetsparametrarna för nätet i plan inkluderar utvärdering av viktenhetens standardosäkerhet (0,64), kontroll av det genomsnittliga k-talet (0,58) samt kontroll enligt HMK:s 3-nivåprincip (2 observationer utanför kassationsgränsen). I höjd togs 9 observationer bort med data-snoopi, Control point surveying involves establishing, supplementing, and/or renovating control points in a control network. The purpose of the thesis is to establish a control network in the horizontal in the SWEREF 99 16 30 reference system and in height in the RH 2000 height system. The network is situated indoors in Building 45, Heimdall, at the University of Gävle. The thesis specifically examines the achievable relative standard uncertainty considering the practical limitations in Building 45 with limited visibility between points. The required relative standard uncertainties for the network are 2-3 mm in the horizontal and 1-2 mm in the height component. To achieve this goal, different ways to plan, mark, measure, and calculate the network are studied. The project methodology broadly follows the recommendations in the Swedish HMK handbook for control point surveying, calculation, and evaluation. First, reconnaissance was made of the preliminary network design, which then formed the basis for simulations. These were made to assess the quality of a particular network design, allowing for the selection of the best possible geometry. Three different planning proposals were developed both in the horizontal and in the vertical. Measurements were carried out using a total station, Trimble S51”, and a digital levelling instrument, Trimble DiNi. By conducting full set measurements and double-measured distances from 45 free stations, and double run levelling of 28 height differences complemented by trigonometric heighting, the horizontal and vertical coordinates of the points were determined. The adjustment and estimation of quality parameters were performed using the network adjustment module in SBG Geo. 34 observations were excluded by data-snooping from an unconstrained adjustment, which was subsequently fitted to the known stations using a Helmert transformation. Quality parameters for the network in the horizontal include evaluation of the standard uncertainty of unit wei