condition mean min max ZT0-3 21.555366 21.555366 21.555366 ZT4-7 17.684401 17.684401 17.684401 ZT8-11 21.2448425 21.2448425 21.2448425 ZT12-15 35.850329 35.850329 35.850329 ZT16-19 30.7097305 30.7097305 30.7097305 ZT20-23 38.160112 38.160112 38.160112