condition mean min max ZT0-3 11.461194333333335 0.4772595 32.88495 ZT4-7 2.13496 2.13496 2.13496 ZT8-11 18.37305 18.37305 18.37305 ZT12-15 133.641675 44.67985 222.6035 ZT16-19 41.16445 41.16445 41.16445 ZT20-23 3.593235 3.593235 3.593235