condition mean min max ZT0-3 13.765075 13.2299 14.30025 ZT4-7 11.9357 11.9357 11.9357 ZT8-11 10.20493 10.20493 10.20493 ZT12-15 0 0 0 ZT16-19 11.772585 11.772585 11.772585 ZT20-23 13.82945 13.82945 13.82945