| Level 3 | Level 4 | Level 5 | Level 6 |
---|---|---|---|---|
Gender | ||||
 Female (N = 775) | 71.52 ± 0.33 | 71.89 ± 0.20 | 73.84 ± 0.21 | 73.18 ± 0.18 |
 Male (N = 604) | 69.83 ± 0.41** | 70.38 ± 0.25** | 69.72 ± 0.61** | 71.19 ± 0.22** |
Mode of entry | ||||
 Not quarantined (N = 1065) | 72.24 ± 0.27 | 71.73 ± 0.17 | 73.35 ± 0.17 | 73.05 ± 0.15 |
 Quarantined (N = 314) | 69.10 ± 0.43** | 70.54 ± 0.26** | 72.18 ± 0.27** | 71.92 ± 0.24** |