condition mean min max ZT0-3 627.5 627.5 627.5 ZT4-7 497.7 497.7 497.7 ZT8-11 446.5 446.5 446.5 ZT12-15 521.8499999999999 521.8499999999999 521.8499999999999 ZT16-19 672.1 672.1 672.1 ZT20-23 641.05 641.05 641.05