condition mean min max ZT0-3 663.802245 663.802245 663.802245 ZT4-7 479.899097 479.899097 479.899097 ZT8-11 461.329727 461.329727 461.329727 ZT12-15 555.5427595 555.5427595 555.5427595 ZT16-19 908.8676465000001 908.8676465000001 908.8676465000001 ZT20-23 1270.13976 1270.13976 1270.13976