Measurements of lion skulls with FM stenosis (FMH< = 16.60 mm) and those with larger FM opening, comparing males and females separately.

Significantly different values in the same raw and within the same sex are marked with a superscript asterisk.FMH = foramen magnum height, BT = basilar thicknessAll comparisons were done using T-test:a t = 2.284, DF = 159, P = 0.024b t = 3.630, DF = 120, Pc t = 1.339, DF = 72, P = 0.185d t = 1.468, DF = 61, P = 0.147e t = 3.283, DF = 265, P = 0.001f t = 2.229, DF = 205, P = 0.027g t = 1.826, DF = 192, P = 0.069h t = 0.826, DF = 145, P = 0.410同一样本内且同一性别的组间存在显著差异的数值将以上标星号标注。FMH（foramen magnum height，枕骨大孔高度）、BT（basilar thickness，颅底厚度）。所有组间比较均采用t检验完成，具体结果如下： a t = 2.284，自由度DF = 159，P = 0.024 b t = 3.630，自由度DF = 120 c t = 1.339，自由度DF = 72，P = 0.185 d t = 1.468，自由度DF = 61，P = 0.147 e t = 3.283，自由度DF = 265，P = 0.001 f t = 2.229，自由度DF = 205，P = 0.027 g t = 1.826，自由度DF = 192，P = 0.069 h t = 0.826，自由度DF = 145，P = 0.410