condition mean min max ZT0-3 739.448044 739.448044 739.448044 ZT4-7 870.4594665 870.4594665 870.4594665 ZT8-11 908.893937 908.893937 908.893937 ZT12-15 954.4051545 954.4051545 954.4051545 ZT16-19 1190.4888474999998 1190.4888474999998 1190.4888474999998 ZT20-23 1066.295611 1066.295611 1066.295611