Characteristics
The American Speech-Language-Hearing Association state that children with (central) auditory processing disorder often:

have trouble paying attention to and remembering information presented orally, and may cope better with visually acquired information
have problems carrying out multi-step directions given orally; need to hear only one direction at a time
have poor listening skills
need more time to process information
have difficulty learning a new language
have difficulty understanding jokes, sarcasm, and learning songs or nursery rhymes
have language difficulties (e.g., they confuse syllable sequences and have problems developing vocabulary and understanding language)
have difficulty with reading, comprehension, spelling, and vocabularyAPD can manifest as problems determining the direction of sounds, difficulty perceiving differences between speech sounds and the sequencing of these sounds into meaningful words, confusing similar sounds such as "hat" with "bat", "there" with "where", etc. Fewer words may be perceived than were actually said, as there can be problems detecting the gaps between words, creating the sense that someone is speaking unfamiliar or nonsense words. In addition, it is common for APD to cause speech errors involving the distortion and substitution of consonant sounds. Those with APD may have problems relating what has been said with its meaning, despite obvious recognition that a word has been said, as well as repetition of the word. Background noise, such as the sound of a radio, television or a noisy bar can make it difficult to impossible to understand speech, since spoken words may sound distorted either into irrelevant words or words that dont exist, depending on the severity of the auditory processing disorder.
Compared with hospital studies, epidemiological studies, which assesses a whole population for otitis media and then evaluate outcomes, have found much weaker evidence for long-term impacts of otitis media on language outcomes. Somatic
It seems that somatic anxiety (that is, physical symptoms of anxiety such as butterflies in the stomach or cotton mouth) and situations of stress may be determinants of speech-hearing disability. Diagnosis
Questionnaires can be used for the identification of persons with possible auditory processing disorders, as these address common problems of listening. They can help in the decision for pursuing clinical evaluation. One of the most common listening problems is speech recognition in the presence of background noise. According to the respondents who participated in a study by Neijenhuis, de Wit, and Luinge (2017), the following symptoms are characteristic in children with listening difficulties, and they are typically problematic with adolescents and adults. They include:
Difficulty hearing in noise
Auditory attention problems
Better understanding in one on one situations
Difficulties in noise localization
Difficulties in remembering oral informationAccording to the New Zealand Guidelines on Auditory Processing Disorders (2017) a checklist of key symptoms of APD or comorbidities that can be used to identify individuals who should be referred for audiological and APD assessment includes, among others:

Difficulty following spoken directions unless they are brief and simple
Difficulty attending to and remembering spoken information
Slowness in processing spoken information
Difficulty understanding in the presence of other sounds
Overwhelmed by complex or "busy" auditory environments e.g.