condition mean min max ZT0-3 67.67713333333333 50.80495 82.6461 ZT4-7 40.47865 40.47865 40.47865 ZT8-11 55.42355 55.42355 55.42355 ZT12-15 69.71125 65.4079 74.0146 ZT16-19 76.6886 76.6886 76.6886 ZT20-23 96.05155 96.05155 96.05155