condition mean min max ZT0-3 5.665077500000001 4.842335 6.48782 ZT4-7 4.41591 4.41591 4.41591 ZT8-11 2.923095 2.923095 2.923095 ZT12-15 0 0 0 ZT16-19 3.4438750000000002 3.4438750000000002 3.4438750000000002 ZT20-23 4.096305 4.096305 4.096305