condition mean min max ZT0-3 0.20718403333333332 0.0 0.5437244999999999 ZT4-7 0.40740750000000003 0.40740750000000003 0.40740750000000003 ZT8-11 0.03838285 0.03838285 0.03838285 ZT12-15 0.0564596 0.0382632 0.074656 ZT16-19 0.0741455 0.0741455 0.0741455 ZT20-23 0.0403135 0.0403135 0.0403135