condition mean min max ZT0-3 20.590109 20.590109 20.590109 ZT4-7 27.2516075 27.2516075 27.2516075 ZT8-11 15.8982605 15.8982605 15.8982605 ZT12-15 16.3847075 16.3847075 16.3847075 ZT16-19 18.794001 18.794001 18.794001 ZT20-23 25.010675499999998 25.010675499999998 25.010675499999998