condition mean min max ZT0-3 2.46178 1.840575 3.08235 ZT4-7 3.9743 3.9743 3.9743 ZT8-11 2.48281 2.48281 2.48281 ZT12-15 6.198460000000001 5.14498 7.25194 ZT16-19 3.46452 3.46452 3.46452 ZT20-23 2.415915 2.415915 2.415915