condition mean min max ZT0-3 0.3961865 0.3961865 0.3961865 ZT4-7 0.369132 0.369132 0.369132 ZT8-11 0.1153345 0.1153345 0.1153345 ZT12-15 0.3316055 0.3316055 0.3316055 ZT16-19 0.23114800000000002 0.23114800000000002 0.23114800000000002 ZT20-23 0.18386435 0.18386435 0.18386435