condition mean min max ZT0-3 20.83655 15.7558 24.076 ZT4-7 14.3987 14.3987 14.3987 ZT8-11 18.7511 18.7511 18.7511 ZT12-15 7.391220000000001 3.39009 11.39235 ZT16-19 4.02679 4.02679 4.02679 ZT20-23 5.426565 5.426565 5.426565