condition mean min max ZT0-3 45.9603 38.04975 51.50505 ZT4-7 37.5982 37.5982 37.5982 ZT8-11 33.8138 33.8138 33.8138 ZT12-15 41.774125 39.929 43.61925 ZT16-19 39.0342 39.0342 39.0342 ZT20-23 46.956900000000005 46.956900000000005 46.956900000000005