condition mean min max ZT0-3 17.38655 17.38655 17.38655 ZT4-7 12.00885 12.00885 12.00885 ZT8-11 11.81495 11.81495 11.81495 ZT12-15 14.750800000000002 14.750800000000002 14.750800000000002 ZT16-19 20.7968 20.7968 20.7968 ZT20-23 17.63545 17.63545 17.63545