condition mean min max ZT0-3 0.261907 0.19938050000000002 0.3244335 ZT4-7 0.7967995 0.7967995 0.7967995 ZT8-11 0.8190385 0.8190385 0.8190385 ZT12-15 0 0 0 ZT16-19 0.9800534999999999 0.9800534999999999 0.9800534999999999 ZT20-23 0.591502 0.591502 0.591502