condition mean min max ZT0-3 11.662874 11.662874 11.662874 ZT4-7 10.6402335 10.6402335 10.6402335 ZT8-11 10.008263 10.008263 10.008263 ZT12-15 9.2625075 9.2625075 9.2625075 ZT16-19 12.859483999999998 12.859483999999998 12.859483999999998 ZT20-23 14.480692000000001 14.480692000000001 14.480692000000001