condition mean min max ZT0-3 5.3986131642499995 4.476857218999999 6.3203691095 ZT4-7 5.85243420075 5.2242284695 6.480639932000001 ZT8-11 6.35692232475 6.3414954675 6.372349182 ZT12-15 6.0296538355 5.5135935285 6.5457141425 ZT16-19 6.56737864175 5.250157473 7.8845998105 ZT20-23 11.027548039500001 9.823452364000001 12.231643715