Psychometric properties of the Chinese Quick Delay Questionnaire-Parent version and its network associations with executive function in children with ADHD

For many children, waiting is a simple act of patience. They can sit through a long story, wait their turn in a game, or hold off on a treat until a parent gives the signal. For children with attention deficit hyperactivity disorder, or ADHD, this same act of waiting can feel like a physical struggle. Their brains often process the passage of time differently, making the idea of a delayed reward feel less valuable than an immediate one. This tendency, known as delay aversion, is not just about being impatient; it is a core feature of how their minds navigate the world. Researchers have long suspected that this struggle with waiting is linked to other challenges these children face, such as trouble focusing or controlling their impulses. However, measuring these feelings in a way that is both accurate and easy to use has been difficult, especially when trying to understand how a child's daily experience connects to their brain's ability to plan and organize.

A team of researchers at Peking University Sixth Hospital set out to test a specific tool designed to capture these feelings: the Quick Delay Questionnaire. This short survey asks parents to rate how their children react to waiting and how they view future rewards. The researchers wanted to know if this tool worked well for Chinese children with ADHD and, more importantly, how the feelings of impatience measured by the questionnaire connected to the children's actual symptoms and their ability to think ahead. By studying 221 children diagnosed with ADHD, the team aimed to see if the questionnaire could reliably distinguish between different types of impatience and if those specific types of impatience were linked to different behavioral problems.

The study began by translating and adapting the questionnaire for Chinese parents, ensuring the questions made sense in their cultural context. The tool consists of two main parts. One part measures delay aversion, which is the negative feeling or frustration a child experiences when forced to wait. The other part measures delay discounting, which is the attitude a child holds toward future gains, specifically whether they value a smaller reward now over a larger reward later. The researchers asked parents to fill out this questionnaire, along with other standard forms that rated the severity of the child's inattention, hyperactivity, and other behavioral issues like aggression or learning difficulties. They also had a small group of children complete a computer task where they had to choose between a small reward available quickly or a larger reward available after a longer wait, allowing the team to compare what parents reported with what the children actually did in a controlled setting.

The results showed that the Chinese version of the questionnaire was a reliable and valid tool. When parents filled it out twice, two weeks apart, their answers were consistent, and the internal consistency of the questions was strong. The questionnaire successfully separated into two distinct categories, confirming that delay aversion and delay discounting are indeed different aspects of a child's experience. However, the study found a surprising disconnect between what parents reported and how children performed on the computer task. The scores parents gave on the questionnaire did not match the choices the children made on the computer. This suggests that a parent's view of their child's daily impatience captures a different reality than a child's performance in a single, structured game. The questionnaire reflects the child's life as it unfolds over time, while the computer task captures a specific moment of decision-making.

When the researchers looked deeper into the data, they found that different types of impatience were linked to different behavioral challenges. The score for delay aversion, the frustration of waiting, was strongly connected to conduct problems. Children whose parents reported higher levels of frustration with waiting were also more likely to display behavioral issues such as aggression or rule-breaking. On the other hand, the score for delay discounting, the preference for immediate rewards, was linked specifically to inattention. Children who showed a stronger tendency to devalue future rewards were more likely to struggle with focusing their attention. This distinction is crucial because it implies that the feeling of being unable to wait and the habit of choosing the quick fix are not just the same problem wearing different masks; they are tied to different parts of a child's behavior.

To understand how these pieces fit together, the researchers built a network map of the relationships between the children's symptoms, their executive function skills, and their delay-related traits. Executive function refers to the brain's management system, which includes skills like planning, organizing, and controlling impulses. In this network, the researchers looked for "bridge" nodes, which are the specific traits that connect different groups of problems. They found that the ability to inhibit impulses, or stop oneself from acting immediately, was the strongest bridge connecting the children's symptoms to their executive function difficulties. Interestingly, delay discounting also served as a significant bridge, linking the children's inattention to their broader executive function challenges. Delay aversion played a smaller, though still noticeable, bridging role. This pattern suggests that the way a child values future rewards is a key link in the chain connecting their inability to focus with their broader struggles in managing their behavior.

The study also revealed differences based on the specific subtype of ADHD a child had. Children with the combined type of ADHD, who show both high inattention and high hyperactivity, scored higher on both delay aversion and delay discounting than children with the predominantly inattentive type. This indicates that children with the combined type may experience a more intense struggle with waiting and a stronger preference for immediate rewards in their daily lives. However, the study noted that the number of children with the predominantly hyperactive-impulsive type and the number of girls in the group were too small to draw firm conclusions about those specific groups.

Ultimately, the research confirms that the Quick Delay Questionnaire is a useful tool for understanding the daily lives of children with ADHD in China. It shows that the frustration of waiting and the preference for immediate rewards are not just vague traits but are measurable factors that connect to specific behavioral and attentional challenges. The findings support a model where different pathways lead to ADHD symptoms: one path involves the motivational struggle with waiting, and another involves the executive difficulty in planning and controlling impulses. While the study cannot prove that one causes the other, it provides a clear map of how these difficulties are intertwined, suggesting that interventions might need to target these specific pathways differently depending on whether a child's primary struggle is with the frustration of waiting or the habit of choosing the quick reward.