condition mean min max ZT0-3 366.771879 366.771879 366.771879 ZT4-7 404.2142205 404.2142205 404.2142205 ZT8-11 423.213793 423.213793 423.213793 ZT12-15 449.451229 449.451229 449.451229 ZT16-19 491.112301 491.112301 491.112301 ZT20-23 482.1090995 482.1090995 482.1090995