condition mean min max ZT0-3 3024.973829 3024.973829 3024.973829 ZT4-7 3960.6585465 3960.6585465 3960.6585465 ZT8-11 4242.3633815 4242.3633815 4242.3633815 ZT12-15 4082.076529 4082.076529 4082.076529 ZT16-19 3954.5086855 3954.5086855 3954.5086855 ZT20-23 3994.2789345 3994.2789345 3994.2789345