condition mean min max ZT0-3 81.15888418 61.38799376 100.92977459999999 ZT4-7 28.699340265 23.57590106 33.82277947 ZT8-11 19.1970351125 15.551644695 22.84242553 ZT12-15 42.06279788250001 34.49015096 49.635444805000006 ZT16-19 52.454669300000006 46.50539872 58.40393988 ZT20-23 61.90506874 60.078681724999996 63.731455755