condition mean min max ZT0-3 0.3191501666666666 0.095076 0.47757499999999997 ZT4-7 0.2571267 0.2571267 0.2571267 ZT8-11 1.482453 1.482453 1.482453 ZT12-15 1.3930835 0.960177 1.82599 ZT16-19 0.92406 0.92406 0.92406 ZT20-23 0.6191635 0.6191635 0.6191635