condition mean min max ZT0-3 14.958738333333335 9.529215 20.7894 ZT4-7 9.3584 9.3584 9.3584 ZT8-11 10.366335 10.366335 10.366335 ZT12-15 11.57694 8.89848 14.2554 ZT16-19 11.73246 11.73246 11.73246 ZT20-23 18.2908 18.2908 18.2908