condition mean min max ZT0-3 53.951469 53.951469 53.951469 ZT4-7 52.240297 52.240297 52.240297 ZT8-11 49.217110000000005 49.217110000000005 49.217110000000005 ZT12-15 43.822194499999995 43.822194499999995 43.822194499999995 ZT16-19 50.00643 50.00643 50.00643 ZT20-23 58.1763375 58.1763375 58.1763375