condition mean min max ZT0-3 9.838465 9.838465 9.838465 ZT4-7 9.36291 9.36291 9.36291 ZT8-11 9.5911485 9.5911485 9.5911485 ZT12-15 9.910586 9.910586 9.910586 ZT16-19 11.3409665 11.3409665 11.3409665 ZT20-23 10.387363 10.387363 10.387363