condition mean min max ZT0-3 12.355674 12.355674 12.355674 ZT4-7 12.200112 12.200112 12.200112 ZT8-11 11.2599305 11.2599305 11.2599305 ZT12-15 11.171967 11.171967 11.171967 ZT16-19 13.77691 13.77691 13.77691 ZT20-23 15.6244875 15.6244875 15.6244875