condition mean min max ZT0-3 41.824349999999995 41.824349999999995 41.824349999999995 ZT4-7 31.9639 31.9639 31.9639 ZT8-11 18.848100000000002 18.848100000000002 18.848100000000002 ZT12-15 14.69045 14.69045 14.69045 ZT16-19 29.933999999999997 29.933999999999997 29.933999999999997 ZT20-23 52.5479 52.5479 52.5479