condition mean min max ZT0-3 59.715532 59.715532 59.715532 ZT4-7 59.627728000000005 59.627728000000005 59.627728000000005 ZT8-11 48.556436000000005 48.556436000000005 48.556436000000005 ZT12-15 44.2551785 44.2551785 44.2551785 ZT16-19 36.3787615 36.3787615 36.3787615 ZT20-23 33.889546 33.889546 33.889546