condition mean min max ZT0-3 0.50852275 0.478071 0.5389744999999999 ZT4-7 0.3174605 0.3174605 0.3174605 ZT8-11 0.330216 0.330216 0.330216 ZT12-15 0 0 0 ZT16-19 0.7334395 0.7334395 0.7334395 ZT20-23 0.6659765 0.6659765 0.6659765