|
Categorical variables
|
Dichotomous variables
|
IRR = Kappa (95% LCL)a
|
Abstractor 1 vs. “gold standard”
|
Abstractor 2 vs. “gold standard”
|
|---|
| | |
N
|
Abstractor 1 vs. Abstractor 2
|
Bias Index
| |
N
|
Agreement (%)
|
Sensitivity (%)
|
Specificity (%)
|
Bias Index
|
N
|
Agreement (%)
|
Sensitivity (%)
|
Specificity (%)
|
Bias Index
|
|---|
|
Stroke type
|
Infarct
|
30
|
1.00
|
0
| |
30
|
100
|
100
|
100
|
0
|
30
|
100
|
100
|
100
|
0
|
|
ICH
|
30
|
1.00
|
0
| |
30
|
100
|
100
|
100
|
0
|
30
|
100
|
100
|
100
|
0
|
|
TIA
|
30
|
0.65 (0.02)
|
−0.03
| |
30
|
100
|
100
|
100
|
0
|
30
|
96.7
|
100
|
96.6
|
0.03
|
|
tPA therapy
|
Yes
|
30
|
1.00
|
0
| |
30
|
100
|
100
|
100
|
0
|
30
|
100
|
100
|
100
|
0
|
|
Symptomatic hemorrhage
|
Yes
|
30
|
1.00
|
0
| |
30
|
100
|
100
|
100
|
0
|
30
|
100
|
100
|
100
|
0
|
|
Disposition
|
Death
|
30
|
1.00
|
0
| |
30
|
100
|
100
|
100
|
0
|
30
|
100
|
100
|
100
|
0
|
|
Home
|
30
|
1.00
|
0
| |
30
|
93.3
|
100
|
91.3
|
0.07
|
30
|
93.3
|
100
|
91.3
|
0.07
|
|
Inpatient rehabilitation
|
30
|
1.00
|
0
| |
30
|
100
|
100
|
100
|
0
|
30
|
100
|
100
|
100
|
0
|
|
Skilled nursing facility
|
30
|
1.00
|
0
| |
30
|
96.7
|
100
|
96.6
|
0.03
|
30
|
96.7
|
100
|
96.6
|
0.03
|
|
Initial presentation
|
MHH
|
30
|
0.92 (0.76)
|
0.03
| |
30
|
100
|
100
|
100
|
0
|
30
|
96.7
|
95.4
|
100
|
−0.03
|
|
Continuous variables
| |
IRR = ICC
d
(95%LCL)
a
|
Abstractor 1 vs. “gold standard”
|
Abstractor 2 vs. “gold standard”
|
| |
N
|
Abstractor 1 vs. Abstractor 2
|
MD
c
(95%CI)
b
|
N
|
Agreement (%)
|
Correlation (95%CI)
b
|
MD
c
(95%CI)
b
|
N
|
Agreement (%)
|
Correlation (95%CI)
b
|
MD
c
(95%CI)
b
|
|
Age (years)
|
30
|
1.00
|
0 (0, 0)
|
30
|
96.7
|
0.83 (0.65, 0.91)
|
1.4 (−1.5, 4.4)
|
30
|
96.7
|
0.83 (0.65, 0.91)
|
1.4 (−1.5, 4.4)
|
|
Onset time (minutes)
|
16
|
1.00
|
4.7 (−14.5, 5.3)
|
16
|
93.8
|
1.00
|
9.4 (−10.6, -29.4)
|
16
|
87.5
|
1.00
|
14.1 (−7.7, 35.8)
|
|
Arrival time (minutes)
|
29
|
1.00
|
0 (0, 0)
|
30
|
86.7
|
1.00
|
−0.2 (−1.9, 1.5)
|
29
|
89.7
|
1.00
|
−0.2 (−2.1, 1.6)
|
|
tPA time (minutes)
|
7
|
−0.48 (−0.89)
|
NR
|
7
|
100
|
1.00
|
0 (0, 0)
|
7
|
57.1
|
−0.49 (−0.90, 0.45)
|
NR
|
|
INR
|
25
|
0.98 (0.96)
|
0.02 (−0.02, 0.06)
|
25
|
80
|
0.98 (0.97, 0.99)
|
−0.01 (−0.04, 0.02)
|
26
|
73.1
|
0.39 (−0.00, 0.67)
|
0.1 (−0.2, 0.4)
|
|
mRS on discharge
|
23
|
1.00
|
0 (0, 0)
|
23
|
95.6
|
0.98 (0.96, 0.99)
|
−0.04 (−0.13, 0.05)
|
26
|
96.2
|
0.98 (0.96, 0.99)
|
−0.04 (−0.12, 0.04)
|
-
a 95% LCL = 95% Lower Confidence Limit; b 95% CI = 95% Confidence Interval; c
MD = Mean difference for reliability study is calculated based on abstractor #1 minus abstractor #2; for validity study the difference is based on abstractor #1 or abstractor #2 minus the “gold standard”; d
ICC = Intra-class correlation; NR = Not reported because calculations were misleading due to an error in re-abstraction by abstractor #2 who reported 3 wrong dates (i.e., a wrong day, month or year) out of 7 dates for patients who received tPA therapy, which resulted in a misleading mean difference.
