Table 2.

Language questions and response options

Question	Response options
How often does your child imitate things they’ve just heard (such as new words)?	0=Never (my child imitates close to 0% of words heard), 1=Sometimes, (my child imitates about 25% of words heard), 2=Often (my child imitates about 50% of words heard), 3=Always or almost always (my child imitates 75% or more of words heard)
How often does your child pretend during play (for example, pretend to put a baby to bed, pretend a block is a phone)?	0=Never (almost none of my child’s play includes pretending), 1=Sometimes (about 25% of my child’s play includes pretending), 2=Often (about 50% of my child’s play includes pretending)
How often does your child use gestures to communicate (for example, to greet someone, to share information, or to tell you what he/she wants or likes)?	0=Never (close to 0% of my child’s communication is a gesture),1=Sometimes (about 25% of my child’s communication includes a gesture), 2=Often (about 50% of my child’s communication includes a gesture),3=Always or almost always (about 75% or more of my child’s communication includes a gesture).
How often does your child respond correctly to spoken directions (for example, “give me the ball”, “get your shoes”)?	0=Never (my child follows close to 0% of directions),1=Sometimes (my child follows about 25% of directions),2=Often (my child follows about 50% of directions),3=Always or almost always (my child follows about 75% of directions or more).
How many different words does your child say?	0=No words, 1=1–2 words, 2=3–10 words, 3=11–50 words, 4=Between 51 and 200 words, 5=Between 200 and 500 words, 6=More than 500 words
How well do strangers understand what your child says?	0=Strangers understand none (0%) of what my child says, 1=Strangers understand very little (25%) of what my child says, 2=Strangers understand about half (50%) of what my child says, 3=Strangers understand most (75%) of what my child says, 4=Strangers understand nearly all (100%) of what my child says
Does your child use correct endings on words (for example, words that end in: -ing, plural -s, -ed)?	0=Never (close to 0% of my child’s words include correct word endings), 1=Sometimes (about 25% of my child’s words include correct word endings), 2=Often (about 50% of my child’s words include correct word endings), 3=Always or almost always (about 75% or more of my child’s words include correct word endings)
On average how many words does your child say in a sentence?	0=None, 1=1 word (e.g. “ball”), 2=2 words (e.g. “more water”, “mommy up”), 3=3 words (e.g. “I want juice”), 4=4+ words (e.g. “I want more juice”).
Is your child combining words (for example, “more juice”, “want banana”)?	0=No, 1=Yes