condition mean min max ZT0-3 137.55232205 117.8666863 157.2379578 ZT4-7 97.001338035 85.35175358 108.65092249 ZT8-11 92.74717537833334 89.06672633 96.42762442666667 ZT12-15 91.56853281166667 86.98380778333333 96.15325784000001 ZT16-19 91.97720968833333 90.46937498666666 93.48504439 ZT20-23 86.77784385833334 86.58966642 86.96602129666667