condition mean min max ZT0-3 15.804175 14.0471 17.56125 ZT4-7 9.142230000000001 9.142230000000001 9.142230000000001 ZT8-11 10.939 10.939 10.939 ZT12-15 0 0 0 ZT16-19 14.73875 14.73875 14.73875 ZT20-23 16.0166 16.0166 16.0166