condition mean min max ZT0-3 68.69011666666667 46.9658 82.77629999999999 ZT4-7 34.9131 34.9131 34.9131 ZT8-11 46.369550000000004 46.369550000000004 46.369550000000004 ZT12-15 43.154625 33.6854 52.623850000000004 ZT16-19 53.81145 53.81145 53.81145 ZT20-23 79.88775 79.88775 79.88775