Table 1. Clinical characteristics of the patients.

Variable	Group A	Group B	Group C	Group D	Mean	P
Number	40	38	41	42
Age (y)	15.22±2.03	14.57±1.66	14.66±1.53	15.13±1.74	14.90	0.246
Height (cm)	158.55±4.71	159.42±4.18	157.71±3.67	158.80±4.64	158.60	0.359
Weight (kg)	47.04±6.37	48.95±5.66	46.88±5.86	48.27±5.88	47.76	0.348
Risser sign	3.60±1.19	3.45±1.03	3.38±1.19	3.29±1.23	3.43	0.682
Major curve (°)	51.60±11.99	49.34±10.27	48.48±8.14	49.54±11.67	49.73	0.596
Bending cobb (°)	13.28±7.46	13.39±6.74	13.10±6.55	13.00±5.59	13.19	0.993
B-Flexibility index	0.75±0.10	0.73±0.12	0.73±0.12	0.74±0.08	0.74	0.849
Alb (g/L)	41.45±2.09	41.50±2.05	40.83±2.19	40.78±1.97	41.13	0.247
Hg (g/L)	123.98±7.04	125.08±8.67	125.31±8.72	125.17±7.89	124.89	0.875
PLT	215.85±35.67	221.37±38.53	222.21±52.09	230.46±46.79	222.53	0.517
APTT (s)	38.34±1.90	37.14±2.39	37.55±2.97	37.54±2.19	37.65	0.168
PT (s)	13.58±0.41	13.39±0.37	13.37±0.47	13.36±0.51	13.42	0.107
Fibrinogen (g/L)	2.62±0.44	2.35±0.47	2.57±0.47	2.60±0.43	2.54	0.039
Thrombin time (s)	16.90±1.67	16.97±1.70	16.87±1.30	16.77±1.50	16.88	0.949
The number of levels fused	10.65±1.67	10.79±1.70	10.64±2.08	10.15±2.22	10.55	0.497
IOBL (ml)	1078.75±295.28	952.11±194.27	863.81±201.77	847.80±266.03	933.98	<0.01
NBL (ml/f*kg)	2.17±0.46	1.83±0.34	1.77±0.34	1.76±0.40	1.87	<0.01