condition mean min max ZT0-3 153.9642008416667 134.96934075000001 172.95906093333335 ZT4-7 146.4930614 133.48919106666665 159.49693173333333 ZT8-11 112.63471935000001 102.8348083 122.4346304 ZT12-15 107.484328335 99.62765127 115.3410054 ZT16-19 87.33603114833333 83.38352595666666 91.28853634000001 ZT20-23 71.47390201 67.91624236333334 75.03156165666667