condition mean min max ZT0-3 268.55 268.55 268.55 ZT4-7 337.6 337.6 337.6 ZT8-11 355.5 355.5 355.5 ZT12-15 392.29999999999995 392.29999999999995 392.29999999999995 ZT16-19 309.45 309.45 309.45 ZT20-23 266.85 266.85 266.85