Analysis of possible outliers for GWTG quantitative data in the Colorado Stroke Alliance Registry

1
Analysis of possible outliers for GWTG
quantitative data in the Colorado Stroke Alliance
Registry

• Don B Smith, MD
• 1/9/09

2
High Outliers 990 976 360
3
High Outliers 1855 1415 737 687 482 400 390 378 37
5 373 345 329 325 320 320 317 315 310 305 303 303
300
High Outliers 2670 2042 1818 1818 1818 1554 1085 1
048 1040 978 951 937 879 879 840 794 781 752 748 7
42 718 676 670 669 654 637 637 625 613
4
High Outliers 363 232 181 157 156 156 150 149 142
128 126 115 114 113 111 103 100 100 100
High Outliers 409 400 400 400 288 287 286 285 271
251 243 239 234 234 233 225
5
High Outliers 639 609 603 509 504 89 72
High Outliers 789 399 348 337 318 313 309 304 303
302
6
inches
centimeters
High Outliers 178 167 165 160 158
High Outliers 200 200 198 197 195 194 193 1
93 193 193 193 193 193 193 193 193 191 1
91 191 191 191 191 191
Median height If measured in inches 56 If
measured in cm 56
7
pounds
kilograms
High Outliers 2296 1386 1356 994
High Outliers 8604 1043 979 903 879 847 839
823 766 762 727 658 618 485 482 477
Median weight If measured in lbs 160 lbs If
measured in kg 160.6 lbs
8
High Outliers 2502.58 339.73 311.85 285.64 271.14
268.6 266.71 265.35 257.98 246.07 238.38 213.02 20
4 198.7 178.88 178.64 177.14 167.58 167.1 147.03 1
13.89
9
Suggested Values to Trigger Warning at Data Input
Quantiles
Variable Mean 0.5 99.5 Age 70.0 24 97 Chole
sterol 166.89 72 299 Triglycerides 133.5 26 672
HDL 42.0 16 96 LDL 98.7 20 218 HA1C 9.37 4.6
61 FBS 107 58 316 ht (inches) 66 54 77 ht
(cm) 168 66 194 weight (lbs) 160 72 337 weight
(kgs) 73 37 218 BMI 25.8 12.9 65.2
These would seem reasonable lower (0.5) and
upper (99.5) limits for data to be accepted
without a warning flag, based on Colorado
experience.