condition mean min max ZT0-3 10.586879 10.586879 10.586879 ZT4-7 11.070037 11.070037 11.070037 ZT8-11 9.4333085 9.4333085 9.4333085 ZT12-15 11.128475 11.128475 11.128475 ZT16-19 10.6736545 10.6736545 10.6736545 ZT20-23 10.888704 10.888704 10.888704