condition mean min max ZT0-3 23.908 23.908 23.908 ZT4-7 18.9034 18.9034 18.9034 ZT8-11 18.8791 18.8791 18.8791 ZT12-15 21.41875 21.41875 21.41875 ZT16-19 23.7691 23.7691 23.7691 ZT20-23 25.5527 25.5527 25.5527