Table 1.

Patient demographics.

Feature	Mean ± SD / N (%)	Range
Age (years)	24.4 ± 6.2	15–50
Gender (male/female)	23/24
Duration of using N2O (months)	8.8 ± 7.1	2–36
Days of using N2O per week	3.2 ± 1.3	1–6
Balls per day (ball)	36.3 ± 23.3	10–100
Last N2O exposure to symptom onset (days)	8.7 ± 6.8	1–35
Superficial sensory disorder	47 (100%)
Decreased sensation of vibration	35 (74.5%)
Decreased muscle strength	41(87.2%)
Decreased/loss tendon reflexes	40 (85.1%)
Romberg’s sign	39 (83%)
Lhermitte’s sign	21 (44.7%)