condition mean min max ZT0-3 17.6949 17.6949 17.6949 ZT4-7 12.40465 12.40465 12.40465 ZT8-11 12.0644 12.0644 12.0644 ZT12-15 16.4282 16.4282 16.4282 ZT16-19 18.69885 18.69885 18.69885 ZT20-23 18.4586 18.4586 18.4586