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Intelligence quotient (IQ) of the patients with SMA types 2 and 3. The IQ of the VCI, PRI, and WMI subcategories of the patients with SMA type 2 (n = 15) and SMA type 3 (n = 17). The mean of normal population is 100. The IQ of the PMI and WMI of the patients with SMA type 2 are significantly reduced (*) compared to the normal population. The IQ of the patients with SMA type 2 compared to type 3 did not differ (n.s.) in the VCI (p = 0.95), PRI (p = 0.097), and WMI (p = 0.115).
