condition mean min max ZT0-3 0.47143999999999997 0.47143999999999997 0.47143999999999997 ZT4-7 0.777717 0.777717 0.777717 ZT8-11 0.49218049999999997 0.49218049999999997 0.49218049999999997 ZT12-15 0.592188 0.592188 0.592188 ZT16-19 0.755929 0.755929 0.755929 ZT20-23 4.516964333333333 4.516964333333333 4.516964333333333