Table 2. Results of statistical analyses (t-test or Mann-Whitney rank sum test) of the height of the wax coverage and the length of the base of lower crystals between successive developmental stages. d. f., degrees of freedom; No, no significant difference; P, probability value; t, t-test statistics; T, Mann-Whitney rank sum test statistics; Yes, significantly different.

Comparison	Normality test	Equal variance test	d. f.	Test statistics	P	Significantly different
height of the wax coverage
1 vs. 2	Passed P = 0.545	Passed P = 0.350	23	t = −23.170	< 0.001	Yes
2 vs. 3	Passed P = 0.187	Failed P < 0.050	-	T = 78.000	< 0.001	Yes
3 vs. 4	Passed P = 0.447	Failed P < 0.050	-	T = 153.000	< 0.001	Yes
4 vs. 5	Passed P = 0.306	Failed P < 0.050	-	T = 336.000	= 0.151	No
5 vs. 6	Passed P = 0.725	Passed P = 0.293	55	t = −15.607	< 0.001	Yes
length of the base of lower crystals
1 vs. 2	Passed P = 0.545	Passed P = 0.350	23	t = −23.170	< 0.001	Yes
2 vs. 3	Passed P = 0.724	Failed P < 0.050	-	T = 125.000	< 0.001	Yes
3 vs. 4	Passed P = 0.300	Passed P = 0.124	34	t = −2.071	= 0.046	Yes
4 vs. 5	Passed P = 0.649	Passed P = 0.580	25	t = 0.095	= 0.925	No
5 vs. 6	Passed P = 0.258	Passed P = 0.283	55	t = 0.233	= 0.817	No