This is a document about the PSS (Perceived Stress Scale) across waves. It is a five-point scale(0=never, 1=almost never, 2=somtimes, 3=fairly often, 4-very often), involving assigning the oppsote score during calculation.TWo sum score are obtained by summing summing across all 14 items and 10 items. Score ranges from 0 to 56 (14 items) and 40(10 items). 216 participants filled in the PSS.

Data exploratory analysis

Table 1.Descriptive Statistics of 10 Items and 14 Items PSS Sum Score across Waves
wave % of Missng in Item10 Item10 Mean(sd) % of Missng in Item14 Item14 Mean(sd)
Wave1 2.31 18.39(4.18) 2.31 25.51(5.34)
Wave2 3.70 17.57(6.88) 4.17 25.18(8.24)
Wave3 0.93 18.88(6.98) 1.39 26.8(8.08)

For the missing pattern, compared to other two waves, wave2 are more likely to be left as missing(table1).There is no statistically significant difference between waves concerning PSS sum score, regardless items included for calculation.(P-value for ANOVA test, 10 items:0.0891, 14 items:0,0565)

Among three waves, there is statistically significant gender difference found in wave2 data only, regardless number of terms included. Using 10 items for calculation, the mean PSS sum score among female is 18.44, which is 15.37 among male (mean difference:-2.57, 95% CI: -5.06,-0.091). Using 14 items for calculation, the mean PSS sum score among female is 25.91. which is 23.34 among male(mean difference:-3.07, 95% CI: -5.12, -1.022)

There is no statistically significant campus difference between waves concerning PSS sum score, regardless items included for calculation.