condition mean min max ZT0-3 4.743539999999999 4.743539999999999 4.743539999999999 ZT4-7 1.6425299999999998 1.6425299999999998 1.6425299999999998 ZT8-11 1.6318899999999998 1.6318899999999998 1.6318899999999998 ZT12-15 1.8721900000000002 1.8721900000000002 1.8721900000000002 ZT16-19 2.24336 2.24336 2.24336 ZT20-23 10.582 10.582 10.582