condition mean min max ZT0-3 2.98982 2.98982 2.98982 ZT4-7 2.694095 2.694095 2.694095 ZT8-11 2.330585 2.330585 2.330585 ZT12-15 2.230175 2.230175 2.230175 ZT16-19 2.856665 2.856665 2.856665 ZT20-23 2.4022550000000003 2.4022550000000003 2.4022550000000003