condition mean min max ZT0-3 60.80286666666667 48.3496 78.1842 ZT4-7 102.1429 102.1429 102.1429 ZT8-11 26.4336 26.4336 26.4336 ZT12-15 48.003275 23.944 72.06255 ZT16-19 19.633699999999997 19.633699999999997 19.633699999999997 ZT20-23 26.13355 26.13355 26.13355