condition mean min max ZT0-3 0.5233835 0.480616 0.566151 ZT4-7 2.419885 2.419885 2.419885 ZT8-11 1.63476 1.63476 1.63476 ZT12-15 0 0 0 ZT16-19 1.0405125 1.0405125 1.0405125 ZT20-23 1.5677050000000001 1.5677050000000001 1.5677050000000001