Table 1.

Items from the Speech-Language Survey.

Survey question	Aspect of communication development
1. Has either of your twins ever had difficulty learning words (vocabulary), forming sentences (using correct grammar), or both?	Expressive language
2. Has either of your twins ever had a hard time understanding what is said to him or her (e.g., understanding age-appropriate directions)?	Receptive language
3. Has it ever seemed that either of your twins pronounces words poorly for his or her age (has trouble making particular speech sounds)?	Articulation
4. Has your first/second born twin ever had hearing problems (hearing loss)?	Hearing