condition mean min max ZT0-3 0.7775449999999999 0.7775449999999999 0.7775449999999999 ZT4-7 0.8691610000000001 0.8691610000000001 0.8691610000000001 ZT8-11 1.0638695 1.0638695 1.0638695 ZT12-15 1.47953 1.47953 1.47953 ZT16-19 1.22565 1.22565 1.22565 ZT20-23 0.972773 0.972773 0.972773