condition mean min max ZT0-3 1.9018076935 1.825142391 1.978472996 ZT4-7 0.76408693275 0.5228554685 1.005318397 ZT8-11 1.594564554 0.9112561735 2.2778729345 ZT12-15 3.9740953195 2.5639281394999998 5.3842624995 ZT16-19 1.8299855685 1.4393011235 2.2206700135 ZT20-23 1.626250276 1.4857100845 1.7667904675000001