condition mean min max ZT0-3 50.194424999999995 44.80385 55.585 ZT4-7 33.13655 33.13655 33.13655 ZT8-11 18.35425 18.35425 18.35425 ZT12-15 0 0 0 ZT16-19 47.2273 47.2273 47.2273 ZT20-23 44.78725 44.78725 44.78725