condition mean min max ZT0-3 12.948315 7.628895 15.7823 ZT4-7 10.226665 10.226665 10.226665 ZT8-11 8.442620000000002 8.442620000000002 8.442620000000002 ZT12-15 8.4286125 8.052155 8.80507 ZT16-19 9.99104 9.99104 9.99104 ZT20-23 17.2182 17.2182 17.2182