![]() ![]() The mean number of reported items per abstract was 10.1 of 21 (standard deviation 2.2). Crucial information on study population, setting, patient sampling, and blinding as well as confidence intervals around accuracy estimates were reported in <50% of the abstracts. Two reviewers independently evaluated the information contained in included abstracts using 21 items deemed important based on published guidance for adequate reporting and study quality assessment. PubMed was searched for reports of studies that had evaluated the diagnostic accuracy of a test against a clinical reference standard, published in 12 high-impact journals in 2012. We aimed to evaluate the informativeness of abstracts of diagnostic accuracy studies. Informative journal abstracts are crucial for the identification and initial appraisal of studies. Measurements of space points with low backgrounds are provided, leading to a vastly improved tracking efficiency for the region with polar angle less than 25°. The forward part of the detector shows average efficiencies of more than 96%, has signal-to-noise ratios of up to 40 in the ministrips, and noise levels at the level of less than one part per million in the pixels. The pixels have dimensions of 330×330 μm 2 and the ministrips have a readout pitch of 200 μm. The amount of material has been kept low with the use of double-sided detectors, double-metal readout, and light mechanics. Impact parameter resolutions have been measured of 28 μm ⊕ 71/(p sin 3/2 θ) μm in Rφ and 34 μm ⊕ 69/p μm in Rz, where p is the track momentum in GeV/ c. In the barrel part, three-dimensional b tagging information is available down to a polar angle of 25°. It consists of a silicon microstrip barrel and endcaps with layers of silicon pixel and ministrip detectors. The Tracker is optimised for the LEP2 physics programme.
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