condition mean min max ZT0-3 3.93612451975 0.258824627 7.6134244125 ZT4-7 30.1975452575 23.500533065 36.89455745 ZT8-11 52.570507555 45.860800835 59.280214275 ZT12-15 27.724535667750004 13.3529933905 42.096077945000005 ZT16-19 6.812886504250001 6.3923614215 7.233411587 ZT20-23 4.50160848225 4.449312166 4.5539047985