condition mean min max ZT0-3 349.462826 349.462826 349.462826 ZT4-7 364.160963 364.160963 364.160963 ZT8-11 413.86083199999996 413.86083199999996 413.86083199999996 ZT12-15 411.2339435 411.2339435 411.2339435 ZT16-19 567.9757845 567.9757845 567.9757845 ZT20-23 526.8270935 526.8270935 526.8270935