condition mean min max ZT0-3 10.4476025 10.053055 10.84215 ZT4-7 14.4729 14.4729 14.4729 ZT8-11 10.04538 10.04538 10.04538 ZT12-15 0 0 0 ZT16-19 11.274899999999999 11.274899999999999 11.274899999999999 ZT20-23 9.78858 9.78858 9.78858