condition mean min max ZT0-3 11.610591666666666 9.771825 12.82975 ZT4-7 10.191310000000001 10.191310000000001 10.191310000000001 ZT8-11 11.24345 11.24345 11.24345 ZT12-15 14.390925000000001 12.3701 16.41175 ZT16-19 14.056899999999999 14.056899999999999 14.056899999999999 ZT20-23 13.480699999999999 13.480699999999999 13.480699999999999