condition mean min max ZT0-3 2.69947 2.69947 2.69947 ZT4-7 3.7011600000000002 3.7011600000000002 3.7011600000000002 ZT8-11 7.267390000000001 7.267390000000001 7.267390000000001 ZT12-15 4.276505 4.276505 4.276505 ZT16-19 5.319115 5.319115 5.319115 ZT20-23 1.6406049999999999 1.6406049999999999 1.6406049999999999