condition mean min max ZT0-3 87.968593 87.968593 87.968593 ZT4-7 66.10790750000001 66.10790750000001 66.10790750000001 ZT8-11 65.7946205 65.7946205 65.7946205 ZT12-15 58.338387499999996 58.338387499999996 58.338387499999996 ZT16-19 60.5310595 60.5310595 60.5310595 ZT20-23 63.555211 63.555211 63.555211