condition mean min max ZT0-3 61.669479215 51.37854249 71.96041594 ZT4-7 22.97984953 22.303792469999998 23.65590659 ZT8-11 26.662865305 24.62587424 28.69985637 ZT12-15 21.374596097500003 20.609717055 22.139475140000002 ZT16-19 31.3251911425 30.784307965 31.86607432 ZT20-23 30.776876174999998 29.052467835 32.501284514999995