condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0377599 0.0377599 0.0377599 ZT8-11 0.0396315 0.0396315 0.0396315 ZT12-15 0.0215591 0.0 0.0431182 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0