condition mean min max ZT0-3 168.8 168.8 168.8 ZT4-7 206.0 206.0 206.0 ZT8-11 248.4 248.4 248.4 ZT12-15 232.35000000000002 232.35000000000002 232.35000000000002 ZT16-19 185.75 185.75 185.75 ZT20-23 123.35000000000001 123.35000000000001 123.35000000000001