condition mean min max ZT0-3 10.853605 10.42331 11.2839 ZT4-7 3.83258 3.83258 3.83258 ZT8-11 6.652285 6.652285 6.652285 ZT12-15 0 0 0 ZT16-19 16.16305 16.16305 16.16305 ZT20-23 11.7933 11.7933 11.7933