condition mean min max ZT0-3 214.528973 214.528973 214.528973 ZT4-7 245.80354 245.80354 245.80354 ZT8-11 149.849403 149.849403 149.849403 ZT12-15 159.84611999999998 159.84611999999998 159.84611999999998 ZT16-19 118.9464945 118.9464945 118.9464945 ZT20-23 160.0782105 160.0782105 160.0782105