condition mean min max ZT0-3 2.6759899999999996 2.6759899999999996 2.6759899999999996 ZT4-7 2.705985 2.705985 2.705985 ZT8-11 2.4661 2.4661 2.4661 ZT12-15 2.964265 2.964265 2.964265 ZT16-19 3.042465 3.042465 3.042465 ZT20-23 2.7813299999999996 2.7813299999999996 2.7813299999999996