condition mean min max ZT0-3 15.250124999999999 14.649899999999999 15.850349999999999 ZT4-7 5.233635 5.233635 5.233635 ZT8-11 3.121565 3.121565 3.121565 ZT12-15 0 0 0 ZT16-19 7.032995 7.032995 7.032995 ZT20-23 11.58085 11.58085 11.58085