Table 2.

The mean percentages of minimum, maximum and mean medulla spinalis doses ± standard deviation for all plans

	Mean dose (range) % ± SD
	Single field-ICRUrp	Single field-IBMCrp	Two opposed fields
Minimums	94.2 (85–102) ± 3.0	103.4 (96–109) ± 3.3	96.2 (94–101) ± 1.5
Maximums	108.8 (101–118) ± 3.6	120.1 (115–129) ± 3.5	103.2 (101–106) ± 1.4
Means	102 (95–112) ± 3.1	112.7 (107–117) ± 2.3	100.3 (98–104) ± 1.3

ICRUrp, the International Commission on Radiation Units and Measurements reference point; IBMCrp, the International Bone Metastasis Consensus Working Party reference point; SD, standard deviation.