condition mean min max ZT0-3 14.151006 14.151006 14.151006 ZT4-7 14.056636000000001 14.056636000000001 14.056636000000001 ZT8-11 12.766937 12.766937 12.766937 ZT12-15 10.8023135 10.8023135 10.8023135 ZT16-19 11.394273 11.394273 11.394273 ZT20-23 13.0829685 13.0829685 13.0829685