condition mean min max ZT0-3 89.6088889 89.6088889 89.6088889 ZT4-7 56.253888890000006 56.253888890000006 56.253888890000006 ZT8-11 57.53722222333333 57.53722222333333 57.53722222333333 ZT12-15 60.90111111 60.90111111 60.90111111 ZT16-19 96.8411111 96.8411111 96.8411111 ZT20-23 112.84555555666667 112.84555555666667 112.84555555666667