condition mean min max ZT0-3 11.95 11.95 11.95 ZT4-7 14.8 14.8 14.8 ZT8-11 5.3 5.3 5.3 ZT12-15 32.949999999999996 32.949999999999996 32.949999999999996 ZT16-19 18.35 18.35 18.35 ZT20-23 27.75 27.75 27.75