condition mean min max ZT0-3 5.39861 5.39861 5.39861 ZT4-7 6.51678 6.51678 6.51678 ZT8-11 4.36615 4.36615 4.36615 ZT12-15 4.56074 4.56074 4.56074 ZT16-19 5.88381 5.88381 5.88381 ZT20-23 5.9611 5.9611 5.9611