condition mean min max ZT0-3 34.890121495833334 34.44939823666667 35.330844755 ZT4-7 33.52963317 32.42143102 34.63783532 ZT8-11 39.05670605 37.79098965 40.32242245 ZT12-15 40.96313212166667 40.6424333 41.283830943333335 ZT16-19 44.122292091666665 41.79496083 46.44962335333334 ZT20-23 42.47421782833334 40.43042579666667 44.51800986