condition mean min max ZT0-3 291.6 291.6 291.6 ZT4-7 518.7 518.7 518.7 ZT8-11 372.05 372.05 372.05 ZT12-15 446.35 446.35 446.35 ZT16-19 345.04999999999995 345.04999999999995 345.04999999999995 ZT20-23 279.7 279.7 279.7