condition mean min max ZT0-3 3.17746 2.8204900000000004 3.53443 ZT4-7 5.322405 5.322405 5.322405 ZT8-11 12.4281 12.4281 12.4281 ZT12-15 0 0 0 ZT16-19 15.2894 15.2894 15.2894 ZT20-23 10.022580000000001 10.022580000000001 10.022580000000001