condition mean min max ZT0-3 50.83921664 36.68309673 64.99533654999999 ZT4-7 89.0409055775 83.205238405 94.87657275 ZT8-11 132.0120912425 109.649992035 154.37419045000001 ZT12-15 114.6299823425 81.691549185 147.5684155 ZT16-19 53.4251461225 48.63163129 58.218660955000004 ZT20-23 43.6085649725 43.272949679999996 43.944180265