condition mean min max ZT0-3 22.5928 22.5283 22.6573 ZT4-7 20.5645 20.5645 20.5645 ZT8-11 28.3198 28.3198 28.3198 ZT12-15 0 0 0 ZT16-19 59.18685 59.18685 59.18685 ZT20-23 34.25975 34.25975 34.25975