condition mean min max ZT0-3 41.184275 37.8694 44.49915 ZT4-7 65.30335 65.30335 65.30335 ZT8-11 70.34935 70.34935 70.34935 ZT12-15 0 0 0 ZT16-19 57.6081 57.6081 57.6081 ZT20-23 52.903800000000004 52.903800000000004 52.903800000000004