condition mean min max ZT0-3 1.1405963333333333 0.9375045 1.496265 ZT4-7 7.355065 7.355065 7.355065 ZT8-11 11.619060000000001 11.619060000000001 11.619060000000001 ZT12-15 19.648397499999998 9.676795 29.619999999999997 ZT16-19 7.98357 7.98357 7.98357 ZT20-23 2.7116249999999997 2.7116249999999997 2.7116249999999997