Risk Factors of Total Blood Loss and Hidden Blood Loss in Patients with Adolescent Idiopathic Scoliosis: A Retrospective Study

Table 2

The potential risk factors of TBL and HBL.

Parameters	Patients	MBL			HBL
		Mean	SD		Mean	SD
Gender
Male	38	1724.75	542.07	0.356	504.78	200.43	0.258
Female	76	1620.88	575.18		460.24	195.80
Age (year)
≥14	62	1600.31	537.45	0.256	465.81	210.45	0.586
<14	52	1721.33	592.82		486.16	182.50
BMI (kg/m^2)
≥17.88	57	1733.87	628.72	0.139	478.37	194.67	0.860
<17.88	57	1577.15	484.06		471.80	202.15
Operative time (min)
≥300	62	1939.87	549.54	<0.001	586.50	182.39	<0.001
<300	52	1316.46	358.23		342.26	116.78
The number of surgical fixation segments
≥10	58	2007.51	517.46	<0.001	614.93	162.55	<0.001
<10	56	1290.93	332.09		330.24	104.14
The number of pedicle screws
≥16.5	57	1972.28	539.72	<0.001	603.93	176.08	<0.001
<16.5	57	1338.73	382.78		346.25	118.27
PLTpre (10^9/L)
≥234.65	57	1611.10	535.24	0.403	448.19	177.17	0.147
<234.65	57	1699.92	592.96		501.99	214.29
PLTpost (10^9/L)
≥177.15	57	1482.81	486.91	0.001	444.15	181.11	0.095
<177.15	57	1828.21	586.78		506.03	209.84
TBV (mL)
≥3318	57	1568.05	544.20	0.417	459.99	210.36	0.098
<3318	57	1742.97	574.78		490.19	184.57
Hospital stay (day)
≥12	77	1755.56	591.98	0.006	493.30	195.22	0.157
<12	37	1447.30	439.36		437.19	199.77
Risser sign
≥4	69	1654.46	619.98	0.980	482.15	216.48	0.639
<4	45	1657.12	472.423		464.26	166.26
Type of scoliosis
1	68	1669.90	566.87	<0.001	469.08	183.24	<0.001
5	37	1472.22	438.07		421.81	186.84
Others	9	2300.27	561.28		739.52	149.25
Correction angle (°)
≥28	59	1750.31	555.71	0.063	507.12	183.29	0.073
<28	55	1553.80	560.21		440.73	208.07

indicates a potential risk factor (). BMI: body mass index; TBL: total blood loss; HBL: hidden blood loss; TBV: total blood volume; PLT_pre: preoperative platelets; PLT_post: postoperative platelets.