condition mean min max ZT0-3 6.358155 6.2074 6.50891 ZT4-7 5.087540000000001 5.087540000000001 5.087540000000001 ZT8-11 9.47499 9.47499 9.47499 ZT12-15 0 0 0 ZT16-19 12.543949999999999 12.543949999999999 12.543949999999999 ZT20-23 9.163509999999999 9.163509999999999 9.163509999999999