Table 5.

Survival rates of offspring.

Weeks after birth	Angle
	0° ≤ θ ≤ 30°	30° < θ ≤ 60°	60° < θ ≤ 90°
1	90.48%a	94.57%a	85.25%a
2	90.48%a	90.22%a	85.25%a
3	88.10%a	86.96%a	85.25%a
4	88.10%a	86.96%a	85.25%a
5	88.10%a	86.96%a	85.25%a
6	88.10%a	86.96%a	85.25%a
7	88.10%a	86.96%a	85.25%a
8	88.10%a	86.96%a	85.25%a

Data were analysed by log-rank (Mantel-Cox) test. ^aValues within a line denote no significant difference among groups (P > 0.05).