condition mean min max ZT0-3 446.40537 446.40537 446.40537 ZT4-7 382.063834 382.063834 382.063834 ZT8-11 271.86064550000003 271.86064550000003 271.86064550000003 ZT12-15 353.066388 353.066388 353.066388 ZT16-19 256.660254 256.660254 256.660254 ZT20-23 226.979454 226.979454 226.979454