condition mean min max ZT0-3 17.060726 17.060726 17.060726 ZT4-7 30.1000715 30.1000715 30.1000715 ZT8-11 60.6859685 60.6859685 60.6859685 ZT12-15 38.1732005 38.1732005 38.1732005 ZT16-19 65.885372 65.885372 65.885372 ZT20-23 48.7189895 48.7189895 48.7189895