condition mean min max ZT0-3 11.311203 11.311203 11.311203 ZT4-7 9.893871 9.893871 9.893871 ZT8-11 11.082930999999999 11.082930999999999 11.082930999999999 ZT12-15 9.339018 9.339018 9.339018 ZT16-19 10.331801 10.331801 10.331801 ZT20-23 9.931391 9.931391 9.931391