Table 2 Relevance, simplicity, clarity, I-CVI, and CVR values of the Persian BISQ

Sleeping arrangement

Sleeping arrangement (infant crib in a separate room, infant in crib in parents’ room, in parent’s bed, infant crib in room with sibling)

0.9

0.8

0.8

0.83

0.8

Sleep position

In what position does your child sleep most of the time? (on his/her belly, on his/her side, on his/her back)

0.8

0.8

0.9

0.83

0.8

Nocturnal sleep duration (hour)

How much time does your child spend in sleep during the NIGHT (between 7 in the evening and 7 in the morning)? (hour)

1

0.9

1

0.97

1

Daytime sleep duration (hour)

How much time does your child spend in sleep during the DAY (between 7 in the morning and 7 in the evening)? (hour)

1

0.9

1

0.97

1

Number of waking at night

Average number of night wakings per night

1

1

1

1.00

1

Night waking duration (hour)

How much time during the night does your child spend in wakefulness (from 10 in the evening to 6 in the morning)? (hour)

1

0.8

0.9

0.90

1

Nocturnal sleep latency (hour)

How long does it take to put your baby to sleep in the evening? (hour)

1

1

1

1.00

1

Sleep situation

How does your baby fall asleep? (while feeding, being rocked, being held, in bed alone, in bed near parent)

0.8

0.8

0.8

0.80

0.8

Sleep onset time (hour: minute)

When does your baby usually fall asleep for the night? (hour: minute)

1

1

1

1.00

1

Maternal view

Do you consider your child’s sleep as a problem?

1

1

0.9

0.97

1