condition mean min max ZT0-3 16.660702 16.660702 16.660702 ZT4-7 16.03769 16.03769 16.03769 ZT8-11 12.4022375 12.4022375 12.4022375 ZT12-15 13.518145 13.518145 13.518145 ZT16-19 13.650161 13.650161 13.650161 ZT20-23 13.777716999999999 13.777716999999999 13.777716999999999