condition mean min max ZT0-3 4.9115375000000006 4.62757 5.195505000000001 ZT4-7 4.893185 4.893185 4.893185 ZT8-11 5.676125000000001 5.676125000000001 5.676125000000001 ZT12-15 0 0 0 ZT16-19 7.8129 7.8129 7.8129 ZT20-23 6.115695 6.115695 6.115695