condition mean min max ZT0-3 48.645066666666665 32.3517 64.7276 ZT4-7 193.8305 193.8305 193.8305 ZT8-11 358.85699999999997 358.85699999999997 358.85699999999997 ZT12-15 73.95045 68.46715 79.43375 ZT16-19 31.965700000000002 31.965700000000002 31.965700000000002 ZT20-23 30.802599999999998 30.802599999999998 30.802599999999998