condition mean min max ZT0-3 12.42475 12.42475 12.42475 ZT4-7 6.614644999999999 6.614644999999999 6.614644999999999 ZT8-11 10.770575000000001 10.770575000000001 10.770575000000001 ZT12-15 12.13059 12.13059 12.13059 ZT16-19 13.46695 13.46695 13.46695 ZT20-23 9.656505 9.656505 9.656505