condition mean min max ZT0-3 21.285666 21.285666 21.285666 ZT4-7 1599.919651 1599.919651 1599.919651 ZT8-11 6186.5871265 6186.5871265 6186.5871265 ZT12-15 3120.095014 3120.095014 3120.095014 ZT16-19 1446.8254725 1446.8254725 1446.8254725 ZT20-23 125.7432785 125.7432785 125.7432785