ðɪ ɐpnˈiəhˌaɪpoʊpnˈiː ˈɪndɛks, lˈaɪk ðɪ ɐpnˈiə ˈɪndɛks ænd hˌaɪpoʊpnˈiː ˈɪndɛks, ɪz kˈælkjʊlˌeɪɾᵻd baɪ dᵻvˈaɪdɪŋ ðə nˈʌmbɚɹ ʌv ɐpnˈiəz ænd hˌaɪpoʊpnˈiːz baɪ ðə nˈʌmbɚɹ ʌv ˈaʊɚz ʌv slˈiːp.
The apnea-hypopnea index, like the apnea index and hypopnea index, is calculated by dividing the number of apneas and hypopneas by the number of hours of sleep.