1794030 WLZ weight-for-length z-score 137 3650709 WFLZ weight-for-length z-scores 6 3650710 WFLZ weight-for-length z-score 5 3737371 zWFL weight-for-length z-score 2 1753554 W/L weight-for-length z-score 1 3737369 ZWFL weight-for-length z-score 1