condition mean min max ZT0-3 2.3982068425 2.183198876 2.613214809 ZT4-7 4.79047590425 3.8300652724999997 5.750886535999999 ZT8-11 8.555707199250001 6.4527042025 10.658710196000001 ZT12-15 8.93411348725 8.633220247 9.2350067275 ZT16-19 6.611360181249999 6.268874395 6.9538459674999995 ZT20-23 10.6201770255 8.624801286 12.615552765