Table 4 Item response theory parameter estimates from the two-parameter generalised partial credit model

We get on together and cope in the hard times

2.32 (2.16, 2.49)

−1.67 (− 1.76, − 1.58)

− 0.84 (− 0.90, − 0.78)

− 0.23 (− 0.28, − 0.18)

We celebrate special days/events

2.29 (2.13, 2.44)

− 1.57 (− 1.66, − 1.49)

− 0.74 (− 0.80, − 0.68)

−0.20 (− 0.25, − 0.15)

We talk with each other about the things that matter

4.08 (3.77, 4.39)

−1.51 (− 1.57, − 1.44)

−0.67 (− 0.72, − 0.63)

0.01 (− 0.03, 0.05)

We are always there for each other

4.71 (4.31, 5.11)

−1.64 (− 1.71, − 1.57)

−0.89 (− 0.94, − 0.85)

−0.30 (− 0.34, − 0.26)

We manage money well

1.10 (1.03, 1.18)

−1.71 (− 1.83, − 1.58)

−0.66 (− 0.75, − 0.58)

0.46 (0.38, 0.54)

We have common interests

2.36 (2.21, 2.52)

−1.58 (− 1.66, − 1.50)

−0.67 (− 0.72, − 0.61)

0.28 (0.23, 0.32)

People are accepted for who they are

2.18 (2.03, 2.33)

−1.87 (− 1.98, − 1.76)

−1.10 (− 1.17, − 1.04)

− 0.35 (− 0.40, − 0.29)

We have good support from mob

0.79 (0.73, 0.85)

−0.65 (− 0.78, − 0.52)

−0.37 (− 0.50, − 0.24)

−0.31 (− 0.43, − 0.18)

We have family knowledge and traditions that we pass on to our children

0.62 (0.57, 0.67)

−1.10 (− 1.25, − 0.94)

0.53 (0.37, 0.68)

−0.38 (− 0.54, − 0.22)