condition mean min max ZT0-3 1.1883477500000001 0.4942505 1.8824450000000001 ZT4-7 0.3025695 0.3025695 0.3025695 ZT8-11 1.088535 1.088535 1.088535 ZT12-15 0 0 0 ZT16-19 1.1681025 1.1681025 1.1681025 ZT20-23 0.489073 0.489073 0.489073