condition mean min max ZT0-3 12.204675 11.7203 12.68905 ZT4-7 12.859449999999999 12.859449999999999 12.859449999999999 ZT8-11 14.5192 14.5192 14.5192 ZT12-15 0 0 0 ZT16-19 14.4043 14.4043 14.4043 ZT20-23 14.059650000000001 14.059650000000001 14.059650000000001