condition mean min max ZT0-3 16.27105 14.430900000000001 17.90835 ZT4-7 14.0953 14.0953 14.0953 ZT8-11 9.86836 9.86836 9.86836 ZT12-15 8.870885 7.49717 10.2446 ZT16-19 7.889415 7.889415 7.889415 ZT20-23 19.593 19.593 19.593