condition mean min max ZT0-3 14.01145 14.01145 14.01145 ZT4-7 12.127749999999999 12.127749999999999 12.127749999999999 ZT8-11 11.62135 11.62135 11.62135 ZT12-15 13.814250000000001 13.814250000000001 13.814250000000001 ZT16-19 18.6859 18.6859 18.6859 ZT20-23 15.86695 15.86695 15.86695