condition mean min max ZT0-3 0.8559413925 0.71779267 0.994090115 ZT4-7 0.7979002749999999 0.6492501055 0.9465504444999999 ZT8-11 1.12886093575 1.0462457729999999 1.2114760985 ZT12-15 0.8643186105 0.7635497820000001 0.9650874389999999 ZT16-19 0.48366708525 0.411712018 0.5556221525 ZT20-23 1.087754868 0.9030403995 1.2724693365