condition mean min max ZT0-3 12.344085 12.344085 12.344085 ZT4-7 14.528150499999999 14.528150499999999 14.528150499999999 ZT8-11 16.4132275 16.4132275 16.4132275 ZT12-15 12.4240715 12.4240715 12.4240715 ZT16-19 13.3313045 13.3313045 13.3313045 ZT20-23 15.001803500000001 15.001803500000001 15.001803500000001