condition mean min max ZT0-3 5.076175 4.694265 5.4580850000000005 ZT4-7 4.2052700000000005 4.2052700000000005 4.2052700000000005 ZT8-11 7.133905 7.133905 7.133905 ZT12-15 0 0 0 ZT16-19 7.964370000000001 7.964370000000001 7.964370000000001 ZT20-23 7.09148 7.09148 7.09148