condition mean min max ZT0-3 31.84675 31.84675 31.84675 ZT4-7 31.707099999999997 31.707099999999997 31.707099999999997 ZT8-11 16.6536 16.6536 16.6536 ZT12-15 12.8773 12.8773 12.8773 ZT16-19 23.079700000000003 23.079700000000003 23.079700000000003 ZT20-23 24.372999999999998 24.372999999999998 24.372999999999998