condition mean min max ZT0-3 4.315485000000001 4.315485000000001 4.315485000000001 ZT4-7 3.161575 3.161575 3.161575 ZT8-11 2.0940700000000003 2.0940700000000003 2.0940700000000003 ZT12-15 1.90275 1.90275 1.90275 ZT16-19 2.92048 2.92048 2.92048 ZT20-23 4.9889600000000005 4.9889600000000005 4.9889600000000005