condition mean min max ZT0-3 6.406985 6.113925 6.700044999999999 ZT4-7 5.179385 5.179385 5.179385 ZT8-11 5.513835 5.513835 5.513835 ZT12-15 0 0 0 ZT16-19 10.172699999999999 10.172699999999999 10.172699999999999 ZT20-23 8.041485 8.041485 8.041485