Table 4.
Individual studies with their respective odds ratios and 95% confidence intervals.
| Study | Val66Met | Genotype counts | p value | ||
|---|---|---|---|---|---|
| Val/Val | Val/Met | Met/Met | |||
| Zhang et al., 2006 [16] | PTSD | 69 (71.88) | 26 (27.08) | 1 (1.04)# | 0.306∗ |
| No PTSD | 166 (66.40) | 74 (29.60) | 10 (4.00) | 0.097∗∗ | |
| Odds ratio (p value) | 1 | 0.845 (0.779) | 0.241 (0.202) | ||
|
| |||||
| Lee et al., 2006 [30] | PTSD | 28 (26.17) | 57 (53.27) | 22 (20.56) | 0.809∗ |
| No PTSD | 48 (29.81) | 82 (50.93) | 31 (19.25) | 0.282∗∗ | |
| Odds ratio (p value) | 1 | 1.192 (0.797) | 1.217 (0.834) | ||
|
| |||||
| Valente et al., 2011 [28] | |||||
| All controls | PTSD | 48 (73.85) | 15 (23.08) | 2 (3.08)# | 0.756∗ |
| No PTSD | 584 (76.14) | 169 (22.03) | 14 (1.83) | 0.284∗∗ | |
| Odds ratio (p value) | 1 | 1.080 (0.962) | 1.738 (0.751) | ||
| Controls only | PTSD | 48 (73.85) | 15 (23.08) | 2 (3.08)# | 0.800∗ |
| No PTSD | 555 (75.72) | 164 (22.37) | 14 (1.91) | 0.314∗∗ | |
| Odds ratio (p value) | 1 | 1.058 (0.980) | 1.652 (0.788) | ||
| PTSD− only | PTSD | 48 (73.85) | 15 (23.08) | 2 (3.08)# | 0.333∗ |
| No PTSD | 29 (85.29) | 5 (14.71) | 0 (0.00)# | 0.075∗∗ | |
| Odds ratio (p value) | 1 | 1.165 (0.482) | 1.860 (0.316) | ||
|
| |||||
| Lyoo et al., 2011 [31] | PTSD | 10 (33.33) | 15 (50.00) | 5 (16.67) | 0.775∗ |
| No PTSD | 14 (38.89) | 18 (50.00) | 4 (11.11)# | 0.253∗∗ | |
| Odds ratio (p value) | 1 | 1.167 (0.950) | 1.750 (0.725) | ||
|
| |||||
| Pivac et al., 2012 [22] | PTSD | 235 (63.00) | 126 (33.78) | 12 (3.22) | 0.702∗ |
| No PTSD | 173 (65.28) | 86 (32.45) | 6 (2.26) | 0.229∗∗ | |
| Odds ratio (p value) | 1 | 1.079 (0.884) | 1.472 (0.687) | ||
|
| |||||
| Zhang et al., 2014 [27] | PTSD | 20 (47.62) | 16 (38.10) | 6 (14.29) | 0.004∗ |
| No PTSD | 294 (70.17) | 104 (24.82) | 21 (5.01) | 0.000∗∗ | |
| Odds ratio (p value) | 1 | 2.262 (0.048) | 4.200 (0.023) | ||
|
| |||||
| Li et al., 2016 [23] | PTSD | 39 (24.22) | 80 (49.69) | 42 (26.09) | 0.159∗ |
| No PTSD | 109 (29.46) | 190 (51.35) | 71 (19.19) | 0.033∗∗ | |
| Odds ratio (p value) | 1 | 1.177 (0.725) | 1.653 (0.120) | ||
|
| |||||
| Dretsch et al., 2016 [29] | PTSD | 28 (68.29) | 8 (69.73) | 5 (12.20) | 0.077∗ |
| No PTSD | 129 (69.73) | 49 (26.49) | 7 (3.78) | 0.163∗∗ | |
| Odds ratio (p value) | 1 | 0.752 (0.755) | 3.291 (0.129) | ||
|
| |||||
| Our study | PTSD | 99 (65.62) | 46 (30.5) | 6 (4.0) | 0.542∗ |
| No PTSD | 71 (67.0) | 28 (26.4) | 7 (6.6) | 0.435∗∗ | |
| Odds ratio (p value) | 1 | 1.178 (0.811) | 0.615 (0.639) | ||
Note. #At least one cell count less than 5; ∗ p value determined by Pearson's χ 2 test; ∗∗ p value determined by Mantel-Haenszel test for trend in a given direction; significant findings are in bold.