condition mean min max ZT0-3 13.419001 13.419001 13.419001 ZT4-7 13.945829 13.945829 13.945829 ZT8-11 13.329372 13.329372 13.329372 ZT12-15 15.4622515 15.4622515 15.4622515 ZT16-19 13.135427 13.135427 13.135427 ZT20-23 11.990390999999999 11.990390999999999 11.990390999999999