condition mean min max ZT0-3 19.91271295 16.95207137 22.87335453 ZT4-7 13.167642545 11.063957965 15.271327125 ZT8-11 15.787681025000001 15.114386835000001 16.460975215 ZT12-15 8.5093699015 7.109204278 9.909535524999999 ZT16-19 8.84489767425 7.7314022155 9.958393133 ZT20-23 12.981053809999999 12.726088794999999 13.236018825