condition mean min max ZT0-3 14.042544 14.042544 14.042544 ZT4-7 12.817988 12.817988 12.817988 ZT8-11 14.05387 14.05387 14.05387 ZT12-15 14.106857 14.106857 14.106857 ZT16-19 16.289978 16.289978 16.289978 ZT20-23 16.9386545 16.9386545 16.9386545