condition mean min max ZT0-3 13.60165 13.60165 13.60165 ZT4-7 10.771550000000001 10.771550000000001 10.771550000000001 ZT8-11 11.39085 11.39085 11.39085 ZT12-15 8.891390000000001 8.891390000000001 8.891390000000001 ZT16-19 14.26785 14.26785 14.26785 ZT20-23 14.765450000000001 14.765450000000001 14.765450000000001