condition mean min max ZT0-3 0.8236683333333333 0.766995 0.926005 ZT4-7 0.0 0.0 0.0 ZT8-11 0.935315 0.935315 0.935315 ZT12-15 1.30138225 0.72574 1.8770245 ZT16-19 1.067467 1.067467 1.067467 ZT20-23 0.39919950000000004 0.39919950000000004 0.39919950000000004