Table 1

Number of errors, error-related adverse events and process indicators, by weekend–weekday admission and epoch

Both epochsEpoch 1Epoch 2
TotalW/EW/DTotalW/EW/DTotalW/EW/D
n (%)n (%)n (%)n (%)n (%)n (%)n (%)n (%)n (%)
Total 4000 2000 2000 2000 1000 1000 2000 1000 1000
Total number of errors1618803815914440474704363341
Number of errors
 None2970 (74.3)1486 (74.3)1484 (74.2)1447 (72.4)723 (72.3)724 (72.4)1523 (76.2)763 (76.3)760 (76.0)
 Any error996 (24.9)497 (24.9)499 (25.0)541 (27.1)269 (26.9)272 (27.2)455 (22.8)228 (22.8)227 (22.7)
 1645 (16.1)328 (16.4)317 (15.9)338 (16.9)178 (17.8)160(16)307 (15.4)150 (15.0)157 (15.7)
 2208 (5.2)100 (5.0)108 (5.4)121 (6.1)53 (5.3)68 (6.8)87 (4.4)47 (4.7)40 (4.0)
 383 (2.1)36 (1.8)47 (2.4)43 (2.2)18 (1.8)25 (2.5)40 (2.0)18 (1.8)22 (2.2)
 431 (0.8)17 (0.9)14 (0.7)22 (1.1)12 (1.2)10 (1.0)9 (0.5)5 (0.5)4 (0.4)
 5 or more29 (0.7)16 (0.8)13 (0.7)17 (0.9)8 (0.8)9 (0.9)12 (0.6)8 (0.8)4 (0.4)
 Missing34 (0.9)17 (0.9)17 (0.9)12 (0.6)8 (0.8)4 (0.4)22 (1.1)9 (0.9)13 (1.3)
Mean number of errors per patient admission*0.4080.4050.4110.4600.4440.4760.3560.3660.345
Patients with one or more adverse events1034954683137351817
Process indicators
 Location not appropriate118 (3.0)59 (3.0)59 (3.0)61 (3.1)29 (2.9)32 (3.2)57 (2.9)30 (3.0)27 (2.7)
 Incomplete vital signs1280 (32.0)596 (29.8)684 (34.2)597 (29.9)280 (28.0)317 (31.7)683 (34.2)316 (31.6)367 (36.7)
 NEWS not recorded2060 (51.5)982 (49.1)1078 (53.9)1090 (54.5)521 (52.1)569 (56.9)970 (48.5)461 (46.1)509 (50.9)
 No specialist review <14 hours documented2811 (70.3)1393 (69.7)1418 (70.9)1448 (72.4)727 (72.7)721 (72.1)1363 (68.2)666 (66.6)697 (69.7)
  • *Calculated using 'total number of errors ÷ (all records excluding errors missing)'.

  • NEWS, National Early Warning Score; W/D, weekday; W/E, weekend.