condition mean min max ZT0-3 16.235100000000003 14.61805 17.85215 ZT4-7 8.141935 8.141935 8.141935 ZT8-11 4.26814 4.26814 4.26814 ZT12-15 0 0 0 ZT16-19 10.452695 10.452695 10.452695 ZT20-23 14.640450000000001 14.640450000000001 14.640450000000001