condition mean min max ZT0-3 0.908956 0.908956 0.908956 ZT4-7 0.969948 0.969948 0.969948 ZT8-11 0.9453035000000001 0.9453035000000001 0.9453035000000001 ZT12-15 1.0493700000000001 1.0493700000000001 1.0493700000000001 ZT16-19 0.5623706666666667 0.5623706666666667 0.5623706666666667 ZT20-23 0.8447279999999999 0.8447279999999999 0.8447279999999999