condition mean min max ZT0-3 11.341245 11.341245 11.341245 ZT4-7 10.13379 10.13379 10.13379 ZT8-11 10.456468000000001 10.456468000000001 10.456468000000001 ZT12-15 8.8847515 8.8847515 8.8847515 ZT16-19 10.430829 10.430829 10.430829 ZT20-23 11.089357 11.089357 11.089357