## 3 Results  
Descriptive data of the study participants are shown in Table 1. Participants were aged 11.5 \(\pm\) 4.5 years, on average, with a high representation of adolescents (46.3%). The proportion of males was higher than females (52.4% vs. 47.6%). The prevalence of excess weight (overweight/obesity) was 42.9%. Only 3.5% of the participants met all the three 24 h movement guidelines. The HRQoL mean score was 84.5 \(\pm\) 15.9.  
Figure 1 shows the prevalence of proxy-reported problems in relation to the five HRQoL dimensions during the COVID-19 pandemic. Most of the problems were in the dimension linked with worries/sadness/unhappy feelings, with participants declaring'some problems' (36.3%) or 'a lot of problems' (3.6%).  
\begin{table}
\begin{tabular}{c c c c} \hline \hline \multirow{2}{*}{**Variables**} & \multicolumn{3}{c}{**Participants (\(n=1099\))**} \\ \cline{2-4}  & **M/n** & **SD/\%** & **CI95\%** \\ \hline Age (years) & 11.5 & 4.5 & 11.2–11.8 \\ Pre-schoolers & 146 & 13.3 & 11.3–15.3 \\ Children & 444 & 40.4 & 37.5–43.3 \\ Adolescents & 509 & 46.3 & 43.4–49.3 \\ Sex & & & \\ Males & 576 & 52.4 & 49.5–55.4 \\ Females & 523 & 47.6 & 44.6–50.5 \\ Nationality & & & \\ Spanish & 604 & 55.0 & 52.0–57.9 \\ Brazilian & 495 & 45.0 & 42.1–48.0 \\ Breakwinner’s educational level & & & \\ University studies & 538 & 49.0 & 46.0–51.9 \\ No university studies & 561 & 51.0 & 48.1–54.0 \\ Socioeconomic status a & & & \\ Low SES & 362 & 32.9 & 30.2–35.7 \\ Medium SES & 529 & 48.1 & 45.2–51.1 \\ High SES & 208 & 18.9 & 16.6–21.2 \\ FAS-III (score) & 7.5 & 2.3 & 7.4–7.6 \\ Anthropometric data & & & \\ Weight (kg) & 43.0 & 19.5 & 41.8–44.2 \\ Height (cm) & 145.5 & 24.8 & 144.0–147.0 \\ BMI (z-score) & 0.9 & 2.0 & 0.8–0.9 \\ Nutritional status b & & & \\ Overweight/Obesity & 467 & 42.5 & 39.6–45.4 \\ KIDMED (score) & 7.0 & 2.4 & 6.9–7.1 \\
24 h movement guidelines & & & \\ Met all three recommendations & 39 & 3.5 & 2.5–4.6 \\ Did not meet all three recommendations & 1060 & 96.5 & 95.4–97.5 \\ HRQoL (core out of 100) & 84.5 & 15.9 & 83.6–85.4 \\ \hline \hline \end{tabular} Data showed as numbers and percentages for categorical variables and as mean and standard deviation for continuous variables. SES: Socioeconomic status; FAS: Family Affluence Scale; BMI: Body mass index; HRQoL: Health-related quality of life. a Socioeconomic status in accordance with the Family Affluence Scale-III. b Nutritional status in accordance with World Health Organization criteria [16].  
\end{table}
Table 1: Participant characteristics (\(n=1099\)).  
Figure 2 depicts the mean differences in HRQoL score in relation to meeting none, one, two, or all three 24 h movement guidelines using ANCOVA. Those participants who met the 24 h guidelines showed a higher HRQoL mean score (M = 91.9; SE = 2.5) than their counterparts that did not meet 24 h movement guidelines (M = 84.3; SE = 0.5; \(p\) = 0.004). Similarly, information concerning the meeting of different 24 h movement guidelines according to nationality or age group are presented in Figures S1 and S2, respectively.  
Figure 1: Distribution of proxy-reported problems in relation to the five different HRQoL dimensions in the analysed sample.  
Figure 2: Mean differences in the HRQoL scale according to the meeting of different 24 h movement guidelines. Adjusted for age, sex, nationality, breadwinner’s educational level, socioeconomic status, body mass index (z-score), and Mediterranean diet.  
The association between meeting none, one, two, or three 24 h guidelines and HRQoL dimensions is shown in Figure 3. Binary logistic regression showed that meeting none (OR = 2.67, CI95% = 1.20-5.95), one (OR = 2.80, CI95% = 1.27-6.16), or two (OR = 2.47, CI95% = 1.03-5.93) guidelines presented with a higher probability of feeling worried, sad, or unhappy during the COVID-19 lockdown in comparison with those meeting all three 24 h guidelines. In another sense, mobility was not affected by meeting none, one, two, or all three 24 h guidelines.