condition mean min max ZT0-3 251.95000000000002 251.95000000000002 251.95000000000002 ZT4-7 156.2 156.2 156.2 ZT8-11 195.5 195.5 195.5 ZT12-15 186.6 186.6 186.6 ZT16-19 223.45 223.45 223.45 ZT20-23 267.20000000000005 267.20000000000005 267.20000000000005