condition mean min max ZT0-3 0.575245636 0.474184434 0.676306838 ZT4-7 0.15490582425 0.111889709 0.1979219395 ZT8-11 7.74818617475 0.9339389125 14.562433437 ZT12-15 24.850236095 21.63378492 28.066687270000003 ZT16-19 8.24570200225 5.715934925 10.7754690795 ZT20-23 1.3318197535 0.7978624910000001 1.865777016