condition mean min max ZT0-3 9.993433285750001 8.740530761 11.2463358105 ZT4-7 20.490664772499997 16.059736325 24.92159322 ZT8-11 32.8716449 28.406544955 37.336744845 ZT12-15 20.3503342495 14.73688408 25.963784419 ZT16-19 9.627038685999999 8.3688008545 10.8852765175 ZT20-23 15.682557655 13.881380515 17.483734795