condition mean min max ZT0-3 88.730152 88.730152 88.730152 ZT4-7 61.932027500000004 61.932027500000004 61.932027500000004 ZT8-11 64.3291675 64.3291675 64.3291675 ZT12-15 60.7114295 60.7114295 60.7114295 ZT16-19 84.444457 84.444457 84.444457 ZT20-23 80.739499 80.739499 80.739499