condition mean min max ZT0-3 10.24764 10.24764 10.24764 ZT4-7 7.9302 7.9302 7.9302 ZT8-11 6.7127300000000005 6.7127300000000005 6.7127300000000005 ZT12-15 7.85125 7.85125 7.85125 ZT16-19 10.6811 10.6811 10.6811 ZT20-23 8.755780000000001 8.755780000000001 8.755780000000001