condition mean min max ZT0-3 11.552722 11.552722 11.552722 ZT4-7 14.402085 14.402085 14.402085 ZT8-11 13.710388 13.710388 13.710388 ZT12-15 12.6320315 12.6320315 12.6320315 ZT16-19 14.772801000000001 14.772801000000001 14.772801000000001 ZT20-23 13.576182 13.576182 13.576182