condition mean min max ZT0-3 8.64575 8.64575 8.64575 ZT4-7 9.0552615 9.0552615 9.0552615 ZT8-11 9.8952435 9.8952435 9.8952435 ZT12-15 8.2036265 8.2036265 8.2036265 ZT16-19 8.542061 8.542061 8.542061 ZT20-23 9.684619 9.684619 9.684619