condition mean min max ZT0-3 12.280216 12.280216 12.280216 ZT4-7 10.581435500000001 10.581435500000001 10.581435500000001 ZT8-11 9.716884499999999 9.716884499999999 9.716884499999999 ZT12-15 8.7437965 8.7437965 8.7437965 ZT16-19 9.130597 9.130597 9.130597 ZT20-23 10.026574499999999 10.026574499999999 10.026574499999999