condition mean min max ZT0-3 0.5975344327500001 0.128368666 1.0667001995 ZT4-7 4.34390846075 2.676565293 6.0112516285 ZT8-11 7.7154274227499995 6.9838240129999996 8.4470308325 ZT12-15 4.293437100749999 3.6132036454999996 4.973670556 ZT16-19 3.80890916425 3.2792650965 4.338553232 ZT20-23 4.70993725075 4.400899085000001 5.0189754165