Table S1. Basic characteristics of four groups.

Variable	TIV group	PPSV23 group	TIV&PPSV23 group	Unvaccinated group	P
Abbreviation: TIV=trivalent influenza vaccine; PPSV23=23-valent pneumococcal polysaccharide vaccine.
Age (years)
<65	41	23	125	151	0.004
≥65	68	46	171	137
Gender
Male	94	52	226	214	0.09
Female	15	17	70	74
Occupation
Coal miner	79	41	230	202	0.01
Other	30	28	66	86
Severity
Mild	12	13	39	43	0.07
Moderate	40	18	120	105
Severe	40	21	101	82
Very severe	17	17	36	58
Comorbidities
Yes	76	42	193	134	0.003
No	33	27	103	154
Smoking
Yes	53	26	100	82	0.002
No	56	43	196	206
Total	109	69	296	288