condition mean min max ZT0-3 246.770518 246.770518 246.770518 ZT4-7 337.46930899999995 337.46930899999995 337.46930899999995 ZT8-11 326.693784 326.693784 326.693784 ZT12-15 307.337456 307.337456 307.337456 ZT16-19 293.2449445 293.2449445 293.2449445 ZT20-23 177.2952175 177.2952175 177.2952175