condition mean min max ZT0-3 2.53822 2.439475 2.636965 ZT4-7 8.056985000000001 8.056985000000001 8.056985000000001 ZT8-11 18.0615 18.0615 18.0615 ZT12-15 0 0 0 ZT16-19 8.814779999999999 8.814779999999999 8.814779999999999 ZT20-23 5.776115 5.776115 5.776115