condition mean min max ZT0-3 9.707831 9.707831 9.707831 ZT4-7 10.373437500000001 10.373437500000001 10.373437500000001 ZT8-11 9.007089 9.007089 9.007089 ZT12-15 9.474118 9.474118 9.474118 ZT16-19 9.2797035 9.2797035 9.2797035 ZT20-23 10.510878 10.510878 10.510878