condition mean min max ZT0-3 325.770518 325.770518 325.770518 ZT4-7 269.9613665 269.9613665 269.9613665 ZT8-11 292.246927 292.246927 292.246927 ZT12-15 314.4808575 314.4808575 314.4808575 ZT16-19 342.853475 342.853475 342.853475 ZT20-23 295.819205 295.819205 295.819205