Table 1 Comparison of breeding parameters between two broods

First

4.85 ± 0.73

2.58 ± 0.20

− 2.62 ± 4.31

4.36 ± 2.58

0.83 ± 0.19

0.81 ± 0.32

Second

5.42 ± 0.93

2.61 ± 0.21

− 0.92 ± 4.68

4.70 ± 3.07

0.80 ± 0.20

0.86 ± 0.23

Paired T tes

t = − 9.648

df = 366

P < 0.001*

t = ‒2.530

df = 366

P = 0.012*

t = − 5.398

df = 366

P < 0.001*

t = ‒1.630

df = 366

P = 0.104

t = 1.568

df = 247

P = 0.118

t = − 2.434

df = 245

P = 0.016*