condition mean min max ZT0-3 0.63631267125 0.472218973 0.8004063695 ZT4-7 1.1142334295 0.9587037455 1.2697631135000003 ZT8-11 1.341028867 1.28670275 1.3953549840000001 ZT12-15 1.643177064 1.480436637 1.8059174910000002 ZT16-19 1.975261305 1.9121391429999999 2.038383467 ZT20-23 2.523030402 2.375662233 2.6703985709999998