Table 5 Inter-observer agreement among and between experienced embryologists and embryology trainees after embryology training sessions indicated by the median (range) value of the kappa coefficient

Parameters day 1

Position of the pronuclei

0.46 (0.24-0.56)

0.50 (0.45-0.56)

0.51 (0.40-0.59)

Size of the pronuclei

0.46 (0.19-0.77)

0.36 (0.29-0.60)

0.38 (0.24-0.68)

Cytoplasmic halo

0.53 (0.40-0.78)

0.61 (0.44-0.63)

0.69 (0.63-0.73)

Parameters day 2

Number of blastomeres

0.85 (0.66-0.91)

0.77 (0.77-0.88)

0.79 (0.79-0.85)

Degree of fragmentation

0.45 (0.35-0.62)

0.68 (0.60-0.76)

0.55 (0.42-0.63)

Size of blastomeres

0.38 (0.10-0.54)

0.59 (0.59-0.64)

0.34 (0.27-0.51)

Pattern of fragmentation

0.41 (0.22-0.47)

0.48 (0.42-0.54)

0.43 (0.42-0.51)

Size of fragments

0.39 (0.21-0.59)

0.53 (0.35-0.54)

0.51 (0.43-0.52)

Multinucleation

0.39 (0.16-0.60)

0.53 (0.52-0.57)

0.25 (0.14-0.66)

Orientation of the cleavage axes

0.74 (0.58-0.89)

0.72 (0.71-0.86)

0.82 (0.64-0.82)

Parameters day 3

Number of blastomeres

0.54 (0.48-0.65)

0.73 (0.73-0.84)

0.50 (0.48-0.56)

Degree of fragmentation

0.21 (0.10-0.47)

0.66 (0.53-0.78)

0.37 (0.29-0.65)

Size of blastomeres

0.45 (0.20-0.56)

0.52 (0.46-0.64)

0.32 (0.24-0.50)

Pattern of fragmentation

0.30 (0.15-0.47)

0.63 (0.53-0.66)

0.37 (0.35-0.49)

Size of fragments

0.42 (0.23-0.61)

0.54 (0.42-0.75)

0.53 (0.35-0.55)