condition mean min max ZT0-3 2.09849 1.9894949999999998 2.286265 ZT4-7 1.435625 1.435625 1.435625 ZT8-11 1.0655715 1.0655715 1.0655715 ZT12-15 2.3372675000000003 2.164965 2.50957 ZT16-19 2.02394 2.02394 2.02394 ZT20-23 2.5309299999999997 2.5309299999999997 2.5309299999999997