Table 3.

Descriptive statistics and correlation coefficients for variables in the longitudinal sample.

Variables	M ± SD	Skewness	Kurtosis	1	2	4	5	6	7	9	10
T1 IU	35.69 ± 8.53	−0.10	−0.33	1
T1 NPOQ	27.18 ± 10.89	0.46	−0.57	0.68⁎⁎	1
T1 worry	24.14 ± 7.44	−0.02	−0.51	0.64⁎⁎	0.62⁎⁎	1
T1 PSQI	5.05 ± 2.30	0.43	0.70	0.41⁎⁎	0.51⁎⁎	0.46⁎⁎	1
T2 IU	35.01 ± 10.02	−0.23	−0.01	0.65⁎⁎	0.56⁎⁎	0.54⁎⁎	0.34⁎⁎	1
T2 NPOQ	28.85 ± 12.10	0.33	−0.55	0.60⁎⁎	0.75⁎⁎	0.54⁎⁎	0.44⁎⁎	0.73⁎⁎	1
T2 worry	23.30 ± 8.06	−0.09	−0.60	0.63⁎⁎	0.63⁎⁎	0.67⁎⁎	0.45⁎⁎	0.70⁎⁎	0.72⁎⁎	1
T2 PSQI	4.67 ± 2.51	0.52	0.35	0.43⁎⁎	0.50⁎⁎	0.46⁎⁎	0.69⁎⁎	0.41⁎⁎	0.47⁎⁎	0.55⁎⁎	1

Note: PSQI: Sleep quality; IU: Intolerance of uncertainty; NPOQ: Negative problem orientation; CAQ: Cognitive avoidance;

^⁎⁎p < 0.01; T1= Time 1, T2 = Time 2.