condition mean min max ZT0-3 4.914745 4.914745 4.914745 ZT4-7 4.133215 4.133215 4.133215 ZT8-11 3.58365 3.58365 3.58365 ZT12-15 5.08356 5.08356 5.08356 ZT16-19 5.03418 5.03418 5.03418 ZT20-23 4.98803 4.98803 4.98803