condition mean min max ZT0-3 2.4129375 1.831835 2.99404 ZT4-7 0.4435975 0.4435975 0.4435975 ZT8-11 0.296183 0.296183 0.296183 ZT12-15 0 0 0 ZT16-19 1.23574 1.23574 1.23574 ZT20-23 1.332615 1.332615 1.332615