condition mean min max ZT0-3 62.45 62.45 62.45 ZT4-7 17.9 17.9 17.9 ZT8-11 17.6 17.6 17.6 ZT12-15 23.05 23.05 23.05 ZT16-19 23.150000000000002 23.150000000000002 23.150000000000002 ZT20-23 41.45 41.45 41.45