condition mean min max ZT0-3 12.891429 12.891429 12.891429 ZT4-7 14.2747295 14.2747295 14.2747295 ZT8-11 12.870079 12.870079 12.870079 ZT12-15 14.273744 14.273744 14.273744 ZT16-19 12.718605 12.718605 12.718605 ZT20-23 14.1378615 14.1378615 14.1378615