Table 1 Demographics of the Sample (N<sub>Covid</sub> = 34, N<sub>No Covid</sub> = 29).

Demographic variables	Covid Group (m ± SE)	No Covid Group (m ± SE)	t(df) = , p =
Gender (Valid N)			χ²(1) = 3.57, p = 0.059
Male	10	14
Female	24	15
Age	15.94 ± 0.34	15.45 ± 0.32	t(61) = − 1.04, p = 0.301
IQ	104.82 (± 2.69)	102.24 (± 1.92)	t(61) = − 0.80, p = 0.428
Vaccinated	21	7	χ²(1) = 8.97, p = 0.003**
Titer (Au/ml)	228.04 ± 28.73	60.59 ± 25.71	t(61) = − 4.28, p = < 0.001***
Self-report: YSR/11–18 years of age
Withdrawn/depressed	58.33 ± 1.09	57.08 ± 1.64	t(52) = 0.66, p = 0.515
Somatic complaints	59.93 ± 1.61	57.25 ± 1.82	t(52) = 1.11, p = 0.274
Anxious-depressed	56.40 ± 1.96	56.67 ± 1.92	t(52) = − 0.10, p = 0.924
Social problems	56.03 ± 1.01	53.79 ± 1.51	t(52) = 1.27, p = 0.209
Thought problems	65.07 ± 1.24	59.63 ± 1.61	t(52) = 2.73, p = 0.009**
Attention problems	57.90 ± 1.44	55.33 ± 1.45	t(52) = 1.24, p = 0.221
Rule-breaking behaviour	55.73 ± 0.91	54.79 ± 0.98	t(52) = 0.70, p = 0.485
Aggressive behaviour	54.60 ± 0.98	52.96 ± 0.87	t(52) = 1.22, p = 0.216
Self-report: BRIEF/11–16 years of age
Inhibit	46.06 ± 1.88	44.00 ± 0.93	t(58) = 0.96, p = 0.330
Shift	49.10 ± 1.72	47.45 ± 1.60	t(58) = 0.70, p = 0.480
Emotional control	48.90 ± 1.82	48.21 ± 1.61	t(58) = 0.29, p = 0.777
Monitor	47.26 ± 1.75	45.38 ± 1.36	t(58) = 0.84, p = 0.404
Working memory	49.87 ± 2.24	48.90 ± 2.23	t(58) = 0.32, p = 0.754
Plan/organize	49.94 ± 1.86	49.79 ± 1.87	t(58) = 0.05, p = 0.957
Organization of materials	51.03 ± 2.37	51.76 ± 1.47	t(58) = − 0.26, p = 0.799
Task completion	46.35 ± 1.68	50.24 ± 2.34	t(58) = − 1.36, p = 0.178

Demographic variables	Covid (M ± SE)	No Covid (M ± SE)	t(df) = , p
Self-report: KINDL/3–17 years of age
Physical well-being	62.30 ± 2.85	71.34 ± 2.85	t(58) = − 1.99, p = 0.052
Emotional well-being	72.18 ± 3.04	77.37 ± 3.24	t(58) = − 1.17, p = 0.247
Self-esteem	66.13 ± 3.43	59.48 ± 3.94	t(58) = 1.28, p = 0.207
family	81.25 ± 2.93	84.48 ± 3.08	t(58) = − 0.76, p = 0.449
Friends	69.56 ± 3.44	76.72 ± 2.84	t(58) = − 1.60, p = 0.116
School	64.11 ± 2.81	61.42 ± 3.59	t(58) = 0.59, p = 0.555
Parent’s report: CBCL/11–18 years of Age
Withdrawn/depressed	53.63 ± 1.29	53.31 ± 0.97	t(51) = − 0.20, p = 0.843
Somatic complaints	56.61 ± 1.48	54.38 ± 1.39	t(52) = − 1.09, p = 0.281
Anxious/depressed	53.11 ± 0.83	53.46 ± 1.27	t(52) = 0.237, p = 0.813
Social problems	53.70 ± 1.11	51.38 ± 0.91	t(51) = − 1.62, p = 0.113
Thought problems	55.25 ± 1.20	52.69 ± 1.05	t(52) = − 1.60, p = 0.116
Attention problems	53.21 ± 1.32	51.00 ± 0.57	t(52) = − 1.55, p = 0.131
Rule-breaking behaviour	52.07 ± 0.90	50.73 ± 0.73	t(52) = − 1.15, p = 0.257
Aggressive behaviour	51.89 ± 0.66	51.35 ± 0.76	t(52) = − 0.55, p = 0.588
Parent ‘s report: BRIEF/11–16 years of age
Inhibit	45.31 ± 1.08	42.69 ± 0.60	t(53) = − 2.05, p = 0.04*
Shift	44.14 ± 1.39	43.27 ± 1.17	t(53) = − 0.47, p = 0.638
Emotional control	59.83 ± 16.67	43.50 ± 1.18	t(53) = − 0.93, p = 0.359
Initiate	44.76 ± 1.64	44.81 ± 1.85	t(53) = 0.02, p = 0.984
Working memory	42.62 ± 1.47	41.81 ± 1.33	t(53) = − 0.41, p = 0.685
Plan/organize	41.86 ± 1.40	43.19 ± 1.77	t(53) = 0.60, p = 0.553
Organization of material	47.24 ± 1.53	44.96 ± 1.89	t(53) = − 0.95, p = 0.348
Monitor	43.00 ± 1.78	41.19 ± 1.56	t(53) = − 0.755, p = 0.454

Demographic variables	Covid (M ± SE)	No Covid (M ± SE)	t(df) = , p
Parent’s report: KINDL/3–17 years of age
Physical well-being	85.13 ± 3.05	83.65 ± 2.48	t(53) = − 0.37, p = 0.712
Emotional well-being	84.06 ± 2.09	85.58 ± 1.83	t(53) = 0.54, p = 0.590
Self-esteem	74.57 ± 2.58	72.36 ± 2.46	t(53) = − 0.62, p = 0.539
Family	83.62 ± 2.33	85.10 ± 2.05	t(53) = 0.47, p = 0.641
Friends	79.96 ± 2.85	78.13 ± 2.89	t(53) = − 0.45, p = 0.654
School	78.45 ± 2.90	75.96 ± 2.94	t(53) = − 0.60, p = 0.550

Table 1 Demographics of the Sample (N_Covid = 34, N_{No Covid} = 29).

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