condition mean min max ZT0-3 64.99775 58.8871 71.1084 ZT4-7 55.9494 55.9494 55.9494 ZT8-11 54.201750000000004 54.201750000000004 54.201750000000004 ZT12-15 0 0 0 ZT16-19 49.754599999999996 49.754599999999996 49.754599999999996 ZT20-23 52.11555 52.11555 52.11555