Table 1.

Patient age, body weight at the time of index surgery, number of earlier surgical procedures, type and length of surgery, relative bleeding as % of the total calculated blood volume, and follow-up time

Pat. no	Age (years)	Body weight (kg)	Diagnosis	No of previous surgery	Type of surgery	Surgery time (min)	Relative bleeding (%)	Follow-up (months)
1	13.5	45	MMC,A	3	APN, UT	860	59	72
2	4	14	MMC,A	2	APN, UT	480	62	67
3	14.7	77	DMD	0	P	360	10	58
4	1.5	15	LA,T	2	APN, UT	120	15	48
5	12.6	52	MMC,A	1	APN, UT	875	30	42
6	16.5	85	MMC,A	5	APN, UT	720	19	37
Mean	10.5	48		2.1		569	32.5	54
Median	13	50		2		600	25	53

Diagnosis in addition to spine deformity: MMC myelomeningocele, DMD Duchenne muscular dystrophy, A intraspinal anomaly, LA lumbosacral agenesis, T tumour

Type of surgery: APN combined anterior and posterior spine surgery and neurosurgery in one session, UT untethering procedure, P posterior only spine surgery