condition mean min max ZT0-3 1.117332 1.117332 1.117332 ZT4-7 0.148973 0.148973 0.148973 ZT8-11 0.585171 0.585171 0.585171 ZT12-15 0.857356 0.857356 0.857356 ZT16-19 2.52735 2.52735 2.52735 ZT20-23 2.059895 2.059895 2.059895