condition mean min max ZT0-3 5.9374675 5.487845 6.38709 ZT4-7 6.398855 6.398855 6.398855 ZT8-11 14.02175 14.02175 14.02175 ZT12-15 0 0 0 ZT16-19 12.3285 12.3285 12.3285 ZT20-23 10.016549999999999 10.016549999999999 10.016549999999999