38 Chapter 3 Results A total of 2,527 patients were eligible for AmpC screening. Response rates over the four-year period are shown in Table 1. A total of 2,126 evaluable cultures (positive growth control) were collected and screened for the presence of AmpC rectal carriage. The median age of screened patients was 66 years (range 0–100 years) and 52% of the patients were female. The median length of hospital stay was 2 (range 0–79) days. In total 1,783 (84%) patients were admitted to a clinical ward, 343 (16%) were considered as day-care. The distribution of patients across various medical specialities is shown in Table 1. Over the four-year period this distribution remained stable, with the majority of patients in internal medicine (25%) and general surgery (17%) wards. Table 1. Overview of the hospitalized patients on the days of survey, cultured patients, negative growth control, response rate, evaluable cultures, as well as baseline characteristics of screened patients in point prevalence surveys over the years (2013–2016). 2013 2014 2015 2016 Total Hospitalized patients on day of survey (no.) 601 652 654 620 2,527 Response rate (%) 85.9% 87.3% 86.2% 83.1% 85.6% No rectal swab taken 85 83 90 105 363 Negative growth control 8 12 4 15 39 Patients with evaluable cultures (%) 508 (84.5%) 557 (85.4%) 560 (85.6%) 501 (80.8%) 2,126 (84.1%) Age in years, median (range)* 65(0-93) 65(0-99) 67(0-100) 67(0-97) 66 (0-100) Male, no. (%)* 259(51%) 268(48%) 269(48%) 231(46%) 1,027 (48%) Hospitalization>2days, no. (%)* 231(46%) 271(49%) 222(40%) 269(54%) 993 (39%) Length of stay on day of culture, median in days, (range)* 2(0-51) 2(0-70) 2(0-47) 3(0-79) 2 (0-79)
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