condition mean min max ZT0-3 10.000702 10.000702 10.000702 ZT4-7 11.346499 11.346499 11.346499 ZT8-11 11.5510505 11.5510505 11.5510505 ZT12-15 11.5076275 11.5076275 11.5076275 ZT16-19 10.3083615 10.3083615 10.3083615 ZT20-23 12.9389815 12.9389815 12.9389815