condition mean min max ZT0-3 0.8558395000000001 0.8558395000000001 0.8558395000000001 ZT4-7 0.6809689999999999 0.6809689999999999 0.6809689999999999 ZT8-11 0.458847 0.458847 0.458847 ZT12-15 0.6028935 0.6028935 0.6028935 ZT16-19 1.6195599999999999 1.6195599999999999 1.6195599999999999 ZT20-23 1.060217 1.060217 1.060217