condition mean min max ZT0-3 5.0272025 4.93814 5.116265 ZT4-7 4.24401 4.24401 4.24401 ZT8-11 4.66355 4.66355 4.66355 ZT12-15 0 0 0 ZT16-19 15.512 15.512 15.512 ZT20-23 6.78761 6.78761 6.78761