condition mean min max ZT0-3 2.5845599999999997 2.5845599999999997 2.5845599999999997 ZT4-7 1.4691049999999999 1.4691049999999999 1.4691049999999999 ZT8-11 1.02801 1.02801 1.02801 ZT12-15 1.564655 1.564655 1.564655 ZT16-19 4.182985 4.182985 4.182985 ZT20-23 2.70226 2.70226 2.70226