condition mean min max ZT0-3 248.2 248.2 248.2 ZT4-7 86.2 86.2 86.2 ZT8-11 242.45000000000002 242.45000000000002 242.45000000000002 ZT12-15 435.6 435.6 435.6 ZT16-19 281.40000000000003 281.40000000000003 281.40000000000003 ZT20-23 112.9 112.9 112.9