Number of Incidents with Responses

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I've been reporting on response time and incidents with responses (response being when the initial response email is sent).  We have changed our reporting methodology slightly to include a field capturing responded by phone.  The field time stamps when another field is chosen as a yes.  The below expression is what I currently use to count how many incidents had responses and am looking to change it to:

Count if inc_performance.intv_type=1 or if dt_phone_response is not null(blank)

current: count(if(inc_performance.intv_type=1,'Y'))

Can anyone assist in this?  Thanks! Vanessa

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