The Operating Theatre Journal - Journal - Page 17
Chi square tables
Chi squared table for type of aortic procedure
65
(137.08) [37.91]
[37.91] 112
112 (43.92)
(43.92) [105.53]
[105.53] 77Combined
(2.99) [5.36]
[5.36] Row Totals
Open
Endovascular
65
(137.08)
(2.99)
347
(274.92)[37.91]
[18.90] 20
20 (88.08)
(88.08)
[52.62]
(6.01)
[2.67]
Prehybrid
65 (137.08)
112
(43.92)[52.62]
[105.53] 227 (6.01)
(2.99) [2.67]
[5.36] 184
347
(274.92)
[18.90]
Posthybrid
347 (274.92) [18.90] 20 (88.08) [52.62]
Column Totals 412
132
2 (6.01) [2.67] 369
9
553 (Grand Total)
Each cell contains observed, (expected cell total) and [the chi squared statistic for each cell].
The chi-square statistic is 222.9843. The p-value is < 0.00001. The result is significant at p < 0.05.
Chi squared table for average DAP (Gy cm² )
Prehybrid
Posthybrid
FEVAR
EVAR
403 (379.61)
(379.61) [1.44]
[1.44]
403
233 (256.39)
(256.39) [2.13]
[2.13]
403
(379.61)
[1.44]
233
53
53
71
53
71
(74.01)
(74.01)
(49.99)
(74.01)
(49.99)
EVAS
[5.97]
[5.97]
[8.83]
[5.97]
[8.83]
40
40
31
40
31
(42.38)
(42.38)
(28.62)
(42.38)
(28.62)
Row Totals
[0.13]
[0.13]
[0.20]
[0.13]
[0.20]
496
335
Column Totals 233
636 (256.39) [2.13] 71
124(49.99) [8.83] 71
31 (28.62) [0.20] 831 (Grand Total)
The chi-square
statistic is
is 18.7035.
18.7035. The
The p-value
is .000087.
.000087. The
The result
result is
is significant
significant at
at p