condition mean min max ZT0-3 38.85358920425 21.9591645385 55.74801387 ZT4-7 5.5745929875 5.164093408499999 5.9850925665000005 ZT8-11 6.9474586565 5.9213140825 7.9736032305 ZT12-15 4.732966265 4.069747039 5.396185491 ZT16-19 4.9358785965 4.259028982 5.612728211 ZT20-23 8.6300942395 7.528348880999999 9.731839598