Table 5. Variation in hemoglobin.

Variable	n	Hb pre (g/dL)		p-value	Δ Hb (%)		p value
Age group
≤ 60 years old	39	13.7	1.4	0.038	−16.2	8.7	0.43
61 to 65 years old	58	13.5	1.1		−18.7	7.5
66 to 70 years old	57	13.4	1.4		−18.6	10.8
> 70	47	12.9	1.2		−16.8	9.2
Sex
Male	61	14.0	1.4	< 0.0001	−16.4	9.9	0.16
Women	140	13.1	1.1		−18.3	8.8
Side
Right	102	13.4	1.3	0.80	−17.8	9.6	0.90
Left	99	13.4	1.2		−17.7	8.7
ASA
ASA 1	18	13.6	1.4	0.56	−15.4	6.2	0.27
ASA 2	180	13.4	1.3		−17.9	9.4
Diabetes
Yes	45	13.4	1.3	0.83	−17.7	8.9	0.96
No	156	13.4	1.3		−17.7	9.2
High blood pressure
Yes	156	13.2	1.2	0.029	−18.1	9.2	0.24
No	45	13.8	1.3		−16.3	9.1
Hypothyroidism
Yes	13	13.2	1.4	0.55	−14.2	5.4	0.037
No	188	13.4	1.3		−18.0	9.3
Obesity
Yes	101	13.4	1.3	0.52	−18.2	8.4	0.49
No	63	13.3	1.4		−17.2	10.0
Type of prosthesis
Fixed	124	13.2	1.2	0.055	−17.7	8.9	0.98
Roundabout	77	13.6	1.3		−17.8	9.6

ANOVA for one factor to compare four categories and Student's t-test for independent samples for two categories. According to Tukey's multiple comparison test, at a level of 5%, it was found that the ≤ 60 age group had significantly higher preoperative Hb levels than the > 70 age group.