condition mean min max ZT0-3 4.3058499999999995 1.40956 6.61417 ZT4-7 0.796315 0.796315 0.796315 ZT8-11 1.131532 1.131532 1.131532 ZT12-15 1.14453125 1.1158375 1.173225 ZT16-19 1.84695 1.84695 1.84695 ZT20-23 4.11569 4.11569 4.11569