condition mean min max ZT0-3 11.381350000000001 11.381350000000001 11.381350000000001 ZT4-7 9.422595000000001 9.422595000000001 9.422595000000001 ZT8-11 8.44124 8.44124 8.44124 ZT12-15 8.148390000000001 8.148390000000001 8.148390000000001 ZT16-19 10.39456 10.39456 10.39456 ZT20-23 12.0008 12.0008 12.0008