condition mean min max ZT0-3 13.490625 11.9758 15.00545 ZT4-7 7.112045 7.112045 7.112045 ZT8-11 6.76724 6.76724 6.76724 ZT12-15 0 0 0 ZT16-19 9.78745 9.78745 9.78745 ZT20-23 11.6308 11.6308 11.6308