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Table 3.

Total length of blood vessels under the air cell(L_ac), the rest of the CAM (L_re),their ratios (L_ac/L_re) and the ratio of the corresponding surface areas(S_ac/S_re) in different days of incubation

	Embryonic age (day)
Parameter	10	12	14	16	18	20	ANOVA (among days)
L_ac (×10⁴ mm)	1.20	1.71	1.18	2.92	3.18	3.67	P<0.001^*
% of day 10	100	142	98	243	265	306
L_re (×10⁴ mm)	5.99	9.56	6.00	9.83	9.11	7.91	P<0.005^*
% of day 10	100	160	100	164	152	132
t-test (between zones)	P<0.001	P<0.001	P<0.001	P<0.005	P<0.001	P<0.05
L_ac/L_re	0.20	0.19	0.20	0.30	0.35	0.47	P<0.005^**
S_ac/S_re	0.13	0.16	0.18	0.21	0.23	0.25	P<0.001^**
N	10	13	13	12	13	6

	Embryonic age (day)
Parameter	10	12	14	16	18	20	ANOVA (among days)
L_ac (×10⁴ mm)	1.20	1.71	1.18	2.92	3.18	3.67	P<0.001^*
% of day 10	100	142	98	243	265	306
L_re (×10⁴ mm)	5.99	9.56	6.00	9.83	9.11	7.91	P<0.005^*
% of day 10	100	160	100	164	152	132
t-test (between zones)	P<0.001	P<0.001	P<0.001	P<0.005	P<0.001	P<0.05
L_ac/L_re	0.20	0.19	0.20	0.30	0.35	0.47	P<0.005^**
S_ac/S_re	0.13	0.16	0.18	0.21	0.23	0.25	P<0.001^**
N	10	13	13	12	13	6

Values are means. Student's t-tests (paired) are between zones. ^*One-way ANOVA among days. ^**Kruskal–Wallis ANOVA,median test among days for the ratio of air cell to rest.

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