condition mean min max ZT0-3 20.439063 20.439063 20.439063 ZT4-7 22.29225 22.29225 22.29225 ZT8-11 23.0363555 23.0363555 23.0363555 ZT12-15 26.104231 26.104231 26.104231 ZT16-19 19.575519 19.575519 19.575519 ZT20-23 20.549741 20.549741 20.549741