|  |  |  | Kruskal-Wallis main test | Kruskal-Wallis pairwise comparison | ||
---|---|---|---|---|---|---|---|
Parameters | Group | Mean | SEM | Â | Â | H | P-value |
Helmet | Â | Â | Â | Â | Â | Â | Â |
Relative helmet length (helmet length/body length) | C (n = 17) | 0.260 | 0.004 | df = 2 | C - N | −37.765 | <0.001 |
 | N (n = 17) | 0.384 | 0.008 | H = 47.235 | C - T | −19.190 | 0.001 |
 | T (n = 21) | 0.322 | 0.004 | P = 0.001 | N - T | 18.574 | 0.001 |
Helmet angle [°] | C (n = 17) | 110.320 | 0.897 | df = 2 | C - N | −11.706 | 0.099 |
 | N (n = 17) | 115.463 | 0.955 | H = 38.662 | C - T | 20.106 | <0.001 |
 | T (n = 21) | 103.573 | 0.559 | P = 0.001 | N - T | 31.812 | <0.001 |
Tail-spine | Â | Â | Â | Â | Â | Â | Â |
Relative tail-spine length (tail-spine length/body length) | C (n = 17) | 0.583 | 0.014 | df = 2 | C - N | −26.529 | <0.001 |
 | N (n = 17) | 0.859 | 0.019 | H = 34.720 | C - T | 1.756 | 1 |
 | T (n = 21) | 0.581 | 0.008 | P = 0.001 | N - T | 28.286 | <0.001 |
Spine angle (°) | C (n = 17) | 160.518 | 1.264 | df = 2 | C - N | −3.471 | 1 |
 | N (n = 17) | 162.494 | 0.811 | H = 38.222 | C - T | 25.61 | <0.001 |
 | T (n = 21) | 143.596 | 0.844 | P = 0.001 | N - T | 29.081 | <0.001 |
Curvature (absolute/effective spine length) | C (n = 17) | 1.005 | 0.001 | df = 2 | C - N | 5.529 | 0.943 |
 | N (n = 17) | 1.003 | 0.000 | H = 34.493 | C - T | −22.964 | <0.001 |
 | T (n = 21) | 1.018 | 0.001 | P = 0.001 | N - T | −28.493 | <0.001 |
Dorsal ridge | Â | Â | Â | Â | Â | Â | Â |
Dorsal ridge width (μm) | C (n = 17) | 30.391 | 0.554 | df = 2 | C - N | 0.294 | 1 |
 | N (n = 17) | 29.857 | 0.676 | H = 37.094 | C - T | −26.853 | <0.001 |
 | T (n = 21) | 50.289 | 0.905 | P = 0.001 | N - T | −27.147 | <0.001 |
Dist. 1. to 10. microspine (μm) | C (n = 17) | 192.558 | 3.070 | df = 2 | C - N | 17.000 | 0.005 |
 | N (n = 17) | 134.432 | 3.981 | H = 47.016 | C - T | 35.500 | <0.001 |
 | T (n = 21) | 47.235 | 1.293 | P = 0.001 | N - T | 18.500 | 0.001 |
Max. microspine length (μm) | C (n = 17) | 39.181 | 1.690 | df = 2 | C - N | −33.706 | <0.001 |
 | N (n = 17) | 61.260 | 1.283 | H = 39.885 | C - T | −20.982 | <0.001 |
 | T (n = 21) | 54.249 | 1.004 | P = 0.001 | N - T | 12.724 | 0.043 |
Microspine angle (°) | C (n = 17) | 19.533 | 0.906 | df = 2 | C - N | −13.941 | 0.029 |
 | N (n = 17) | 28.490 | 1.243 | H = 43.776 | C - T | −33.971 | <0.001 |
 | T (n = 21) | 78.571 | 1.307 | P = 0.001 | N - T | −20.029 | <0.001 |