condition mean min max ZT0-3 1.7684725000000001 1.757455 1.77949 ZT4-7 1.149147 1.149147 1.149147 ZT8-11 2.5088049999999997 2.5088049999999997 2.5088049999999997 ZT12-15 0 0 0 ZT16-19 2.468065 2.468065 2.468065 ZT20-23 1.73628 1.73628 1.73628