condition mean min max ZT0-3 2.7170625 2.30662 3.127505 ZT4-7 2.68308 2.68308 2.68308 ZT8-11 1.7539850000000001 1.7539850000000001 1.7539850000000001 ZT12-15 0 0 0 ZT16-19 3.5860700000000003 3.5860700000000003 3.5860700000000003 ZT20-23 2.65218 2.65218 2.65218