| Study | PSV | T‐tube | P value |
| Esteban 1997 | 12d (IQ not available, N = 205) | 10d (IQ not available, N = 192) | P = 0.33 |
| Matić 2004 | 270h (IQ 235‐290, N = 30) | 331h (IQ 292‐396, N = 30) | < 0.001 |
| Matić 2007 | 210h (IQ 186‐241, N = 32) | 241h (IQ 211‐268, N = 31) | < 0.001 |
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