condition mean min max ZT0-3 18.611800000000002 18.611800000000002 18.611800000000002 ZT4-7 18.7405 18.7405 18.7405 ZT8-11 16.12415 16.12415 16.12415 ZT12-15 14.905199999999999 14.905199999999999 14.905199999999999 ZT16-19 18.395899999999997 18.395899999999997 18.395899999999997 ZT20-23 15.26465 15.26465 15.26465