condition mean min max ZT0-3 0.22849041574999998 0.0 0.45698083149999996 ZT4-7 10.95399498625 6.0076695325000005 15.90032044 ZT8-11 20.2450371225 19.042824555000003 21.44724969 ZT12-15 15.73741589475 13.2221560545 18.252675735 ZT16-19 6.945757264 6.847283309 7.044231219 ZT20-23 6.5361157495 6.228125267 6.844106232