condition mean min max ZT0-3 55.85382428 53.26408919 58.44355937 ZT4-7 31.7813110525 28.67129781 34.891324295000004 ZT8-11 50.527501349999994 42.155824575 58.899178125 ZT12-15 33.5602804425 23.72774724 43.392813645000004 ZT16-19 24.907359697500002 22.937323325 26.877396070000003 ZT20-23 33.73775549 32.397302775 35.078208205