condition mean min max ZT0-3 28.643749999999997 28.643749999999997 28.643749999999997 ZT4-7 17.00235 17.00235 17.00235 ZT8-11 12.62952 12.62952 12.62952 ZT12-15 12.247955000000001 12.247955000000001 12.247955000000001 ZT16-19 17.56615 17.56615 17.56615 ZT20-23 27.493699999999997 27.493699999999997 27.493699999999997