condition mean min max ZT0-3 14.4439 12.08985 16.47005 ZT4-7 12.9888 12.9888 12.9888 ZT8-11 13.3886 13.3886 13.3886 ZT12-15 14.00615 13.5552 14.4571 ZT16-19 11.1707 11.1707 11.1707 ZT20-23 11.61025 11.61025 11.61025