condition mean min max ZT0-3 351.77317197499997 332.86937515 370.6769688 ZT4-7 81.781093645 65.7279274 97.83425989 ZT8-11 79.9185518675 62.29702482 97.54007891500001 ZT12-15 132.13035267499998 117.11615119999999 147.14455415 ZT16-19 218.534849275 206.85435685 230.2153417 ZT20-23 271.477062925 261.56303790000004 281.3910879499999