condition mean min max ZT0-3 9.663874 9.663874 9.663874 ZT4-7 10.819324 10.819324 10.819324 ZT8-11 9.773794500000001 9.773794500000001 9.773794500000001 ZT12-15 9.8554605 9.8554605 9.8554605 ZT16-19 10.115207 10.115207 10.115207 ZT20-23 10.374719500000001 10.374719500000001 10.374719500000001