condition mean min max ZT0-3 239.170569 239.170569 239.170569 ZT4-7 322.5604325 322.5604325 322.5604325 ZT8-11 410.2786855 410.2786855 410.2786855 ZT12-15 329.3286795 329.3286795 329.3286795 ZT16-19 285.86411999999996 285.86411999999996 285.86411999999996 ZT20-23 269.0876695 269.0876695 269.0876695