condition mean min max ZT0-3 4.47253 4.278175 4.666885 ZT4-7 4.82629 4.82629 4.82629 ZT8-11 5.2091899999999995 5.2091899999999995 5.2091899999999995 ZT12-15 0 0 0 ZT16-19 6.0164550000000006 6.0164550000000006 6.0164550000000006 ZT20-23 5.90423 5.90423 5.90423