condition mean min max ZT0-3 15.200000000000001 15.200000000000001 15.200000000000001 ZT4-7 72.2 72.2 72.2 ZT8-11 15.95 15.95 15.95 ZT12-15 59.6 59.6 59.6 ZT16-19 76.0 76.0 76.0 ZT20-23 76.65 76.65 76.65