condition mean min max ZT0-3 4.87883 4.87883 4.87883 ZT4-7 4.436615 4.436615 4.436615 ZT8-11 4.84917 4.84917 4.84917 ZT12-15 4.06273 4.06273 4.06273 ZT16-19 4.0260750000000005 4.0260750000000005 4.0260750000000005 ZT20-23 4.49615 4.49615 4.49615