condition mean min max ZT0-3 163.918099 163.918099 163.918099 ZT4-7 81.54888299999999 81.54888299999999 81.54888299999999 ZT8-11 109.70369199999999 109.70369199999999 109.70369199999999 ZT12-15 144.69987 144.69987 144.69987 ZT16-19 354.6258405 354.6258405 354.6258405 ZT20-23 230.4253005 230.4253005 230.4253005