condition mean min max ZT0-3 11.6696575 9.316715 14.0226 ZT4-7 19.08965 19.08965 19.08965 ZT8-11 20.8734 20.8734 20.8734 ZT12-15 0 0 0 ZT16-19 18.15205 18.15205 18.15205 ZT20-23 14.00505 14.00505 14.00505