condition mean min max ZT0-3 11.63115 11.63115 11.63115 ZT4-7 10.219325000000001 10.219325000000001 10.219325000000001 ZT8-11 9.55485 9.55485 9.55485 ZT12-15 10.780999999999999 10.780999999999999 10.780999999999999 ZT16-19 13.948350000000001 13.948350000000001 13.948350000000001 ZT20-23 11.5882 11.5882 11.5882