condition mean min max ZT0-3 12.149999999999999 12.149999999999999 12.149999999999999 ZT4-7 34.6 34.6 34.6 ZT8-11 54.3 54.3 54.3 ZT12-15 49.95 49.95 49.95 ZT16-19 38.5 38.5 38.5 ZT20-23 23.4 23.4 23.4