condition mean min max ZT0-3 12.27825 12.27825 12.27825 ZT4-7 11.215883999999999 11.215883999999999 11.215883999999999 ZT8-11 11.071644500000001 11.071644500000001 11.071644500000001 ZT12-15 11.741520999999999 11.741520999999999 11.741520999999999 ZT16-19 10.9637695 10.9637695 10.9637695 ZT20-23 10.878266 10.878266 10.878266