condition mean min max ZT0-3 1.4353235 0.8979105000000001 1.82417 ZT4-7 3.513095 3.513095 3.513095 ZT8-11 8.808015 8.808015 8.808015 ZT12-15 11.4260625 10.391774999999999 12.46035 ZT16-19 9.03583 9.03583 9.03583 ZT20-23 6.937615 6.937615 6.937615