Table 3.

Mean/Standard deviation and ANOVA test for frustration based on surgery times, bloodloss, spine level, age and BMI.

Frustration		Surgery time	Blood loss	Level	Age	BMI
0	Mean	71.00	200.00	4.33	80.67	25.67
	N	3	3	3	3	3
	SD	10.82	100.00	1.15	2.08	3.21
1	Mean	105.80	340.00	6.20	66.20	26.20
	N	5	5	5	5	5
	SD	45.40	238.22	2.17	16.93	4.32
2	Mean	109.25	412.50	7.50	69.75	26.25
	N	4	4	4	4	4
	SD	16.05	332.60	2.38	16.84	2.99
3	Mean	132.00	400.00	5.50	75.50	25.50
	N	2	2	2	2	2
	SD	16.97	141.42	4.95	7.78	6.36
4	Mean	96.67	1200.00	3.67	55.67	25.00
	N	3	3	3	3	3
	SD	42.83	1562.05	1.53	8.02	3.61
Total	Mean	101.94	491.18	5.65	68.82	25.82
	N	17	17	17	17	17
	SD	33.78	679.89	2.49	14.28	3.47

		Square sum	df	Quadratic mean	F	Significance
ANOVA test
Surgery time * frustration	Between the groups	5050.73	4	1262.68	1.15	0.38
	In the groups	13,208.22	12	1100.69
	Total	18,258.94	16
Bloodloss * frustration	Between the groups	1,917,301.47	4	479,325.37	1.05	0.42
	In the groups	5,478,875.00	12	456,572.92
	Total	7,396,176.47	16
Level * frustration	Between the groups	32.25	4	8.06	1.43	0.28
	In the groups	67.63	12	5.64
	Total	99.88	16
Age * frustration	Between the groups	1067.09	4	266.77	1.46	0.28
	In the groups	2195.38	12	182.95
	Total	3262.47	16
BMI * frustration	Between the groups	3.75	4	0.94	.06	0.99
	In the groups	188.72	12	15.73
	Total	192.47	16