condition mean min max ZT0-3 330.361599 330.361599 330.361599 ZT4-7 401.089388 401.089388 401.089388 ZT8-11 576.2963975 576.2963975 576.2963975 ZT12-15 408.0849815 408.0849815 408.0849815 ZT16-19 455.37358500000005 455.37358500000005 455.37358500000005 ZT20-23 450.80808950000005 450.80808950000005 450.80808950000005