condition mean min max ZT0-3 11.848825 11.5215 12.17615 ZT4-7 6.9357299999999995 6.9357299999999995 6.9357299999999995 ZT8-11 4.515655 4.515655 4.515655 ZT12-15 0 0 0 ZT16-19 7.748429999999999 7.748429999999999 7.748429999999999 ZT20-23 8.555335 8.555335 8.555335