condition mean min max ZT0-3 50.800000000000004 50.800000000000004 50.800000000000004 ZT4-7 36.2 36.2 36.2 ZT8-11 67.2 67.2 67.2 ZT12-15 50.85 50.85 50.85 ZT16-19 93.64999999999999 93.64999999999999 93.64999999999999 ZT20-23 75.15 75.15 75.15