condition mean min max ZT0-3 1.75028125 1.3838775 2.116685 ZT4-7 3.044475 3.044475 3.044475 ZT8-11 2.676755 2.676755 2.676755 ZT12-15 0 0 0 ZT16-19 2.9669299999999996 2.9669299999999996 2.9669299999999996 ZT20-23 3.3086900000000004 3.3086900000000004 3.3086900000000004