condition mean min max ZT0-3 324.180712 324.180712 324.180712 ZT4-7 568.9376395 568.9376395 568.9376395 ZT8-11 81.52317 81.52317 81.52317 ZT12-15 69.40723399999999 69.40723399999999 69.40723399999999 ZT16-19 12.7726045 12.7726045 12.7726045 ZT20-23 9.6095195 9.6095195 9.6095195