condition mean min max ZT0-3 15.030999999999999 15.030999999999999 15.030999999999999 ZT4-7 12.5291 12.5291 12.5291 ZT8-11 12.65135 12.65135 12.65135 ZT12-15 13.2979 13.2979 13.2979 ZT16-19 15.65315 15.65315 15.65315 ZT20-23 14.6939 14.6939 14.6939