condition mean min max ZT0-3 20.532016666666664 12.045449999999999 25.796999999999997 ZT4-7 15.261700000000001 15.261700000000001 15.261700000000001 ZT8-11 20.36755 20.36755 20.36755 ZT12-15 36.7414275 14.641805000000002 58.841049999999996 ZT16-19 28.798499999999997 28.798499999999997 28.798499999999997 ZT20-23 18.6516 18.6516 18.6516