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Table 1 Comparison of age and education level of MSM who use nitrite inhalants and of MSM who do not use nitrite inhalants in China

From: Association of nitrite inhalants use and unprotected anal intercourse and HIV/syphilis infection among MSM in China: a systematic review and meta-analysis

Study Age Education
Age category (years) Nitrite inhalants users
N(%)a
Nitrite inhalants nonusers
N(%)a
Education level Nitrite inhalants users
N(%)a
Nitrite inhalants nonusers
N(%)a
Chen et al. (2016) [24] 16–20 9 (7.4) 92 (13.1)* Senior high school and below 4 (3.3) 29 (4.1)
21–25 61 (50.0) 389 (55.3) College/Bachelors 79 (64.8) 457 (65.0)
26–30 52 (42.6) 222 (31.6) Masters or PhD 39 (32.0) 217 (30.9)
Chu (2013) [17] ≤30 99 (82.5) 317 (62.8)* Senior high school and below 64 (53.3) 326 (64.6)*
> 30 21 (17.5) 188 (37.2) College/Bachelors and above 56 (46.7) 179 (35.4)
Li (2014) [19] ≤28 417 (66.1) 1070 (49.2)* Senior high school and below 276 (43.7) 1055 (48.5)*
> 28 214 (33.9) 1105 (50.8) College/Bachelors and above 355 (56.3) 1120 (51.5)
Li et al. (2014) [25] < 25 49 (25.9) 33 (15.6)* ≤12 years education experience 49 (25.9) 93 (44.1)*
≥25 140 (74.1) 178 (84.4) > 12 years education experience 140 (74.1) 118 (55.9)
Wang et al. (2017) [26] 18–30 109 (71.7) 193 (53.9)* Less than college 53 (34.9) 200 (55.9)*
31–70 43 (28.3) 165 (46.1) College and above 99 (65.1) 158 (44.1)
Xu et al. (2017) [27] < 25 103 (41.9) 309 (38.9)* Less than college 54 (22.0) 234 (29.5)*
25–49 139 (56.5) 441 (55.5) College and above 192 (78.0) 560 (70.5)
≥50 4 (1.6) 44 (5.5)    
Zhang et al. (2016)b [28] 18–34 831 (86.6) 2007 (76.5)* Senior high school and below 191 (19.9) 818 (31.1)*
35–75 129 (13.4) 618 (23.5) College/Bachelors and above 770 (80.1) 1809 (68.9)
Zhao et al. (2017) [29] < 20 36 (11.9) 170 (15.2) Senior high school and below 66 (21.8) 303 (27.0)
20–29 203 (67.0) 695 (62.0) College/Bachelors 219 (72.3) 750 (66.9)
≥30 64 (21.1) 256 (22.8) Masters or PhD 18 (5.9) 68 (6.1)
  1. a Percentages may not add up to 100 because of rounding
  2. b This study has missing data for either age or educational level
  3. Ten studies did not include any information on the age or on the education level of MSM who use nitrite inhalants and of MSM who do not use nitrite inhalants and thus were not included in this table
  4. The comparison of the distribution of age or the distribution of education level between MSM who use nitrite inhalants and MSM who do not use nitrite inhalants were included in this table if the comparison was available in the study. Comparisons used the chi-squared test, and a P-value of less than 0.05 was defined as significant and marked with *