condition mean min max ZT0-3 63.703206 63.703206 63.703206 ZT4-7 69.9456255 69.9456255 69.9456255 ZT8-11 67.88972050000001 67.88972050000001 67.88972050000001 ZT12-15 65.6732125 65.6732125 65.6732125 ZT16-19 60.98878450000001 60.98878450000001 60.98878450000001 ZT20-23 45.8670985 45.8670985 45.8670985