condition mean min max ZT0-3 1.03435975 0.5958844999999999 1.472835 ZT4-7 0.717919 0.717919 0.717919 ZT8-11 0.6630525 0.6630525 0.6630525 ZT12-15 0 0 0 ZT16-19 1.017876 1.017876 1.017876 ZT20-23 0.6256135 0.6256135 0.6256135