condition mean min max ZT0-3 49.33825 49.33825 49.33825 ZT4-7 42.2862 42.2862 42.2862 ZT8-11 31.44215 31.44215 31.44215 ZT12-15 29.61075 29.61075 29.61075 ZT16-19 36.70615 36.70615 36.70615 ZT20-23 41.586 41.586 41.586