condition mean min max ZT0-3 494.931134725 393.65415319999994 596.20811625 ZT4-7 402.0377032 345.3453765 458.73002990000003 ZT8-11 200.45956710000002 190.2961488 210.6229854 ZT12-15 71.847932665 38.02601137 105.66985396 ZT16-19 51.9480046825 41.331953354999996 62.56405601 ZT20-23 177.99829657 141.53422629000002 214.46236685