condition mean min max ZT0-3 0.84867275 0.220346 1.4769995 ZT4-7 0.6784195 0.6784195 0.6784195 ZT8-11 0.156698 0.156698 0.156698 ZT12-15 0 0 0 ZT16-19 0.203988 0.203988 0.203988 ZT20-23 0.897038 0.897038 0.897038