condition mean min max ZT0-3 4.35356 4.35356 4.35356 ZT4-7 3.6354249999999997 3.6354249999999997 3.6354249999999997 ZT8-11 3.36485 3.36485 3.36485 ZT12-15 4.279484999999999 4.279484999999999 4.279484999999999 ZT16-19 4.301645 4.301645 4.301645 ZT20-23 3.7108600000000003 3.7108600000000003 3.7108600000000003