condition mean min max ZT0-3 13.1607 13.1607 13.1607 ZT4-7 9.18192 9.18192 9.18192 ZT8-11 10.63391 10.63391 10.63391 ZT12-15 11.62702 11.62702 11.62702 ZT16-19 12.87093 12.87093 12.87093 ZT20-23 10.87739 10.87739 10.87739