condition mean min max ZT0-3 11.5045175 9.344135000000001 13.6649 ZT4-7 6.859360000000001 6.859360000000001 6.859360000000001 ZT8-11 5.737445 5.737445 5.737445 ZT12-15 0 0 0 ZT16-19 2.704685 2.704685 2.704685 ZT20-23 7.4386849999999995 7.4386849999999995 7.4386849999999995