condition mean min max ZT0-3 9.794329999999999 9.794329999999999 9.794329999999999 ZT4-7 6.503629999999999 6.503629999999999 6.503629999999999 ZT8-11 6.761565 6.761565 6.761565 ZT12-15 8.429245 8.429245 8.429245 ZT16-19 11.58165 11.58165 11.58165 ZT20-23 9.93275 9.93275 9.93275