condition mean min max ZT0-3 12.277131666666667 5.640395 16.09055 ZT4-7 5.534685 5.534685 5.534685 ZT8-11 6.824315 6.824315 6.824315 ZT12-15 13.124175 12.43065 13.817699999999999 ZT16-19 14.7257 14.7257 14.7257 ZT20-23 21.55665 21.55665 21.55665