condition mean min max ZT0-3 227.35000000000002 227.35000000000002 227.35000000000002 ZT4-7 192.9 192.9 192.9 ZT8-11 210.14999999999998 210.14999999999998 210.14999999999998 ZT12-15 137.4 137.4 137.4 ZT16-19 210.7 210.7 210.7 ZT20-23 279.3 279.3 279.3