condition mean min max ZT0-3 34.418584 34.418584 34.418584 ZT4-7 50.628944 50.628944 50.628944 ZT8-11 47.497996 47.497996 47.497996 ZT12-15 39.147421 39.147421 39.147421 ZT16-19 44.637821 44.637821 44.637821 ZT20-23 45.032996 45.032996 45.032996