condition mean min max ZT0-3 1.815065 1.815065 1.815065 ZT4-7 1.618515 1.618515 1.618515 ZT8-11 1.7292900000000002 1.7292900000000002 1.7292900000000002 ZT12-15 1.6071550000000001 1.6071550000000001 1.6071550000000001 ZT16-19 2.774475 2.774475 2.774475 ZT20-23 1.63579 1.63579 1.63579