condition mean min max ZT0-3 15.651563595749998 11.2968226115 20.00630458 ZT4-7 19.608461745 14.149605095 25.067318395 ZT8-11 39.22928598 31.002979345 47.455592615 ZT12-15 40.7970380325 39.36142934 42.232646724999995 ZT16-19 36.163418855 35.78576081 36.5410769 ZT20-23 45.867883055 43.093763285 48.642002825