condition mean min max ZT0-3 12.169095 12.169095 12.169095 ZT4-7 9.8765255 9.8765255 9.8765255 ZT8-11 10.2707575 10.2707575 10.2707575 ZT12-15 10.457398 10.457398 10.457398 ZT16-19 12.7410555 12.7410555 12.7410555 ZT20-23 11.6105565 11.6105565 11.6105565