condition mean min max ZT0-3 57.24028333333334 52.676050000000004 60.826750000000004 ZT4-7 41.424800000000005 41.424800000000005 41.424800000000005 ZT8-11 25.61405 25.61405 25.61405 ZT12-15 29.944975 26.3782 33.51175 ZT16-19 34.326100000000004 34.326100000000004 34.326100000000004 ZT20-23 38.3259 38.3259 38.3259